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Types of Pollution

Pollution  is defined as introducing harmful substances (solid, liquid, or gas) or any form of energy (light, heat, sound, or radioactivity) into the environment. The harmful elements that damage air, water, and land quality and cause pollution are called pollutants.

Pollution is primarily human-made, but nature can have an adverse effect also sometimes acts as a source of pollution.

What are the Different Types of Pollution: Causes and Effects

The three major types of environmental pollution are air, water, and soil. Besides these three main types, there are noise, light, thermal, and radioactive pollutions.

1. Air Pollution

The air in our atmosphere has a roughly stable chemical composition consisting of nitrogen, oxygen, argon, carbon dioxide, and trace amounts of other gases. Any change in the air composition due to the addition of unwanted gases such as sulfur dioxide, carbon monoxide, and nitrogen oxides, chemicals, particulate matter, and biological molecules is called air pollution.

Among all other types of pollution, air pollution is found to have the most diverse impact on Earth.

Sources/Causes

Air pollution can happen from both human-made (anthropogenic) and natural sources. Some of the significant sources of air pollution are given below:

• Burning of fossil fuels such as coal, oil, and natural gas
• Exhaust from automobiles and industries
• Indiscriminate cutting of trees (deforestation)
• Wildfires resulting from burning stubble and farm residues
• Release of methane from microbial decay
• Excessive discharge of greenhouse gases like carbon dioxide and nitrous oxide
• Chlorofluorocarbons (CFCs) released from aerosols sprays, refrigerants, and air conditioners
• Release volcanic ash and gases
• Respiratory disorders in humans such as asthma, lung cancer, chronic bronchitis, and other lung problems
• Formation of smog that reduces visibility
• Formation of acid rain
• Depletion of the ozone layer
• Global warming
• Hazards to wildlife
• Planting of trees (afforestation) purifies the air
• Use of renewable energy such as sunlight and wind energy and reducing dependence on nonrenewable sources such as coal, petroleum, and natural gas
• Increasing efficiency in energy usage
• Use of eco-friendly vehicles
• Cleaning of industry emissions before their release into the atmosphere
• Reducing dependence on vehicles

2. Water Pollution

Water pollution occurs when toxic pollutants and particulate matter are introduced into water bodies such as oceans, rivers, lakes, ponds, and aquifers, making them impure and toxic. These contaminants are primarily generated by human activities and sometimes by natural disasters.

Among all other types of pollution, water pollution is found to have the maximum adverse consequences on the ecosystem.

• Industrial and domestic sewage discharge
• Oil spills and natural gas leakage into water bodies from underground sites called petroleum seeps
• Social practices such as washing, bathing, and littering in water bodies and religious practices
• Agricultural runoff containing pesticides, fertilizers, herbicides, slurry, debris, and manures
• Mining and drilling sometimes make underground water contaminated
• Floods and storm carrying dust and debris to the water bodies
• Algal bloom (eutrophication) caused due to an increase in nutrients of the water bodies
• Reducing dissolved oxygen in the water bodies thus disrupting aquatic life
• Disturbing the pH and salinity of the water bodies leading to loss of aquatic life
• Increasing the risk of water-borne diseases such as hepatitis, cholera, diarrhea, and typhoid in humans
• Increasing the level of toxins and pollutants at each successive level of the food chain (biomagnification)
• Proper disposing of domestic, agricultural, and industrial wastes before releasing them into water bodies
• Using sewage treatment methods such as precipitation, ion exchange, reverse osmosis , and coagulation
• Reducing reusing, and recycling of water
• Using plants such as water hyacinth that absorbs heavy metals in areas contaminated with radioactive pollutants

3. Soil Pollution

Sometimes called land pollution, it refers to the degradation of land quality due to unwanted chemicals and other factors in the soil. Such chemicals change the soil’s chemical and biological properties, thus affecting plant growth. Green plants, being the primary producer, absorb those pollutants, which are then passed through the food chain, affecting the whole ecosystem.

Soil pollution can seep into groundwater or run off to the nearest streams and lakes, creating a vicious pollution cycle.

• Intensive farming leading to the overuse of agrochemicals such as pesticides, fertilizers, herbicides, slurry, debris, and manures
• Improper disposal of wastes from paper mills, sugar factories, petroleum, and chemical industries
• Dust particles such as silica dust
• Urban wastes consisting of garbage and rubbish materials, dried sludge, and sewage from households and commercial bodies
• Accidental oil spills from oil refineries
• Radioactive pollutants such as radium, thorium, and uranium from power plants
• Acid rain, increasing the acidity of the soil
• Deforestation that increases soil erosion causing low soil fertility
• Loss of soil fertility making it unfit for agriculture
• Adverse effect on the growth of flora and fauna in the soil
• Groundwater pollution
• Increasing the salinity of the soil, making it unfit for agriculture
• Causing respiratory problems, neuromuscular blockage, and various forms of cancer, especially lung cancer
• Causing nausea, headache, eye irritation, skin rash, and depression
• Use of organic matures instead of artificial fertilizers in agriculture
• Planting of trees (Afforestation)
• Treating solid wastes such as garbage, domestic refuse, and industrial materials before dumping them in landfills
• Recovering and recycling of materials such as plastics, cloth, and glass before dumping

4. Other Types of Pollution

1. Light Pollution

Light pollution refers to the excessive amount of light in the night sky. It occurs due to excessive, misdirected, and inefficient lighting systems by humans. It is also called photo pollution that disrupts the ecosystem by reducing the distinction between night and day.

Although light pollution seems to have a lesser impact than any other form, it is expected to have consequences similar to air or water pollution.

• Increased energy consumption through over-illumination from artificial light sources such as street lighting, domestic lighting, and garage
• Poor planning by engineers while placing street lights and signage
• Overpopulation increases electricity consumption, which increases glare
• Smog and fog due to air pollution reflect light emitted by cities, making the surrounding look much brighter
• Produce behavioral changes in animals. Nocturnal animals, who are active at night, venture out during the daytime. In contrast, diurnal animals, which are active during the day, remain active at night
• Affecting migration pattern in seasonal birds
• Difficulty for astronomers to see the stars properly
• Affecting newly hatched turtles that rely on starlight to guide them from the beach to the ocean. They often head in the wrong direction.
• Causing flowering and developmental patterns in plants
• Inducing smog by destroying nitrate radicals, helping in the dispersion of smog, and causing air pollution
• Inducing a delay in melatonin secretion in humans, which delays sleep at night
• Reducing the use of decorative lightings that produce more light and consumes more energy
• Use of covered bulbs or light that face downwards
• Switching to an LED light that reduces luminance without compromising visibility
• Proper planning during installation of street lights and signage
• Switching off street lights during daytime
• Using glare-free lighting in the outdoors
• Stopping light-trespass

2. Noise Pollution

It refers to the excessive amount of sound in the surroundings disrupting the natural balance. The acceptable amount of sound is about 60 to 65 decibels, which is the same as our everyday conversation.

Sound levels above 85 decibels are harmful depending on the duration of exposure. Noise above 140 decibels can cause permanent hearing loss. Also, the duration of exposure to the sound is found to have negative health impacts.

• Noise from heavy machines in factories, mills, and industries
• Traffic noise from vehicles (trains and buses) and airplanes
• Construction noises from boring and drilling machines
• Noise from firecrackers and loudspeakers in social events
• Household noises from television, mixer grinders, and music systems
• Loss of hearing and behavioral disorders
• Loss of focus on work leading to low work output
• Stress and Hypertension (high blood pressure)
• Lack of sleep and fatigue
• Difficulty in speech and impairment
• Hearing disorders like tinnitus
• Songbirds, such as robins, fail to communicate and find food
• Disrupting sonar, used by marine animals to communicate and locate food
• Honking in public places like hospitals, academic institutions such as schools and colleges should be banned
• Installing adequate soundproof systems in commercial buildings and hospitals
• Afforestation as trees can absorb sound
• Restricting the use of firecrackers during festivities and doing open public rallies

Apart from the types of pollution discussed, there are other forms of pollution called  thermal or heat pollution  and  radioactive pollution .

Thermal pollution is caused due to excessive heat in the environment released from industrial power plants, deforestation, urban sprawl, and air pollution. It increases the Earth’s atmosphere causing drastic climate change and extinction of wildlife. In contrast, radioactive pollution   results from   accidental leakage from nuclear power plants and improper disposal of nuclear wastes. It can cause massive, long-lasting impacts such as cancer, infertility, blindness, and congenital disabilities.

Ans . Air pollution.

Ans . The seven types of pollution are air, water, soil, light, noise, thermal, and radioactive pollution.

Ans . Smog is a type of air pollution. It is a combination of fog and particulate matter that remain suspended in the air.

Ans . Carbon monoxide is a gaseous air pollutant.

Ans . Groundwater pollution can occur due to chemical spills from industries, household runoff during transportation, illegal dumping of wastes, mining operations, and atmospheric depositions.

• Pollution – Nationalgeographic.org
• Pollution: Types, Sources and Characteristics – Open.edu
• Pollution Facts & Types of Pollution – Livescience.com
• Pollution: Sources & Types – Geo.libretexts.org
• How Many Types Of Pollution Are There? – Worldatlas.com

Article was last reviewed on Friday, February 17, 2023

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ENCYCLOPEDIC ENTRY

Air pollution.

Air pollution consists of chemicals or particles in the air that can harm the health of humans, animals, and plants. It also damages buildings.

Biology, Ecology, Earth Science, Geography

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Air pollution consists of chemicals or particles in the air that can harm the health of humans, animals, and plants. It also damages buildings. Pollutants in the air take many forms. They can be gases , solid particles, or liquid droplets. Sources of Air Pollution Pollution enters the Earth's atmosphere in many different ways. Most air pollution is created by people, taking the form of emissions from factories, cars, planes, or aerosol cans . Second-hand cigarette smoke is also considered air pollution. These man-made sources of pollution are called anthropogenic sources . Some types of air pollution, such as smoke from wildfires or ash from volcanoes , occur naturally. These are called natural sources . Air pollution is most common in large cities where emissions from many different sources are concentrated . Sometimes, mountains or tall buildings prevent air pollution from spreading out. This air pollution often appears as a cloud making the air murky. It is called smog . The word "smog" comes from combining the words "smoke" and " fog ." Large cities in poor and developing nations tend to have more air pollution than cities in developed nations. According to the World Health Organization (WHO) , some of the worlds most polluted cities are Karachi, Pakistan; New Delhi, India; Beijing, China; Lima, Peru; and Cairo, Egypt. However, many developed nations also have air pollution problems. Los Angeles, California, is nicknamed Smog City. Indoor Air Pollution Air pollution is usually thought of as smoke from large factories or exhaust from vehicles. But there are many types of indoor air pollution as well. Heating a house by burning substances such as kerosene , wood, and coal can contaminate the air inside the house. Ash and smoke make breathing difficult, and they can stick to walls, food, and clothing. Naturally-occurring radon gas, a cancer -causing material, can also build up in homes. Radon is released through the surface of the Earth. Inexpensive systems installed by professionals can reduce radon levels. Some construction materials, including insulation , are also dangerous to people's health. In addition, ventilation , or air movement, in homes and rooms can lead to the spread of toxic mold . A single colony of mold may exist in a damp, cool place in a house, such as between walls. The mold's spores enter the air and spread throughout the house. People can become sick from breathing in the spores. Effects On Humans People experience a wide range of health effects from being exposed to air pollution. Effects can be broken down into short-term effects and long-term effects . Short-term effects, which are temporary , include illnesses such as pneumonia or bronchitis . They also include discomfort such as irritation to the nose, throat, eyes, or skin. Air pollution can also cause headaches, dizziness, and nausea . Bad smells made by factories, garbage , or sewer systems are considered air pollution, too. These odors are less serious but still unpleasant . Long-term effects of air pollution can last for years or for an entire lifetime. They can even lead to a person's death. Long-term health effects from air pollution include heart disease , lung cancer, and respiratory diseases such as emphysema . Air pollution can also cause long-term damage to people's nerves , brain, kidneys , liver , and other organs. Some scientists suspect air pollutants cause birth defects . Nearly 2.5 million people die worldwide each year from the effects of outdoor or indoor air pollution. People react differently to different types of air pollution. Young children and older adults, whose immune systems tend to be weaker, are often more sensitive to pollution. Conditions such as asthma , heart disease, and lung disease can be made worse by exposure to air pollution. The length of exposure and amount and type of pollutants are also factors. Effects On The Environment Like people, animals, and plants, entire ecosystems can suffer effects from air pollution. Haze , like smog, is a visible type of air pollution that obscures shapes and colors. Hazy air pollution can even muffle sounds. Air pollution particles eventually fall back to Earth. Air pollution can directly contaminate the surface of bodies of water and soil . This can kill crops or reduce their yield . It can kill young trees and other plants. Sulfur dioxide and nitrogen oxide particles in the air, can create acid rain when they mix with water and oxygen in the atmosphere. These air pollutants come mostly from coal-fired power plants and motor vehicles . When acid rain falls to Earth, it damages plants by changing soil composition ; degrades water quality in rivers, lakes and streams; damages crops; and can cause buildings and monuments to decay . Like humans, animals can suffer health effects from exposure to air pollution. Birth defects, diseases, and lower reproductive rates have all been attributed to air pollution. Global Warming Global warming is an environmental phenomenon caused by natural and anthropogenic air pollution. It refers to rising air and ocean temperatures around the world. This temperature rise is at least partially caused by an increase in the amount of greenhouse gases in the atmosphere. Greenhouse gases trap heat energy in the Earths atmosphere. (Usually, more of Earths heat escapes into space.) Carbon dioxide is a greenhouse gas that has had the biggest effect on global warming. Carbon dioxide is emitted into the atmosphere by burning fossil fuels (coal, gasoline , and natural gas ). Humans have come to rely on fossil fuels to power cars and planes, heat homes, and run factories. Doing these things pollutes the air with carbon dioxide. Other greenhouse gases emitted by natural and artificial sources also include methane , nitrous oxide , and fluorinated gases. Methane is a major emission from coal plants and agricultural processes. Nitrous oxide is a common emission from industrial factories, agriculture, and the burning of fossil fuels in cars. Fluorinated gases, such as hydrofluorocarbons , are emitted by industry. Fluorinated gases are often used instead of gases such as chlorofluorocarbons (CFCs). CFCs have been outlawed in many places because they deplete the ozone layer . Worldwide, many countries have taken steps to reduce or limit greenhouse gas emissions to combat global warming. The Kyoto Protocol , first adopted in Kyoto, Japan, in 1997, is an agreement between 183 countries that they will work to reduce their carbon dioxide emissions. The United States has not signed that treaty . Regulation In addition to the international Kyoto Protocol, most developed nations have adopted laws to regulate emissions and reduce air pollution. In the United States, debate is under way about a system called cap and trade to limit emissions. This system would cap, or place a limit, on the amount of pollution a company is allowed. Companies that exceeded their cap would have to pay. Companies that polluted less than their cap could trade or sell their remaining pollution allowance to other companies. Cap and trade would essentially pay companies to limit pollution. In 2006 the World Health Organization issued new Air Quality Guidelines. The WHOs guidelines are tougher than most individual countries existing guidelines. The WHO guidelines aim to reduce air pollution-related deaths by 15 percent a year. Reduction Anybody can take steps to reduce air pollution. Millions of people every day make simple changes in their lives to do this. Taking public transportation instead of driving a car, or riding a bike instead of traveling in carbon dioxide-emitting vehicles are a couple of ways to reduce air pollution. Avoiding aerosol cans, recycling yard trimmings instead of burning them, and not smoking cigarettes are others.

Downwinders The United States conducted tests of nuclear weapons at the Nevada Test Site in southern Nevada in the 1950s. These tests sent invisible radioactive particles into the atmosphere. These air pollution particles traveled with wind currents, eventually falling to Earth, sometimes hundreds of miles away in states including Idaho, Utah, Arizona, and Washington. These areas were considered to be "downwind" from the Nevada Test Site. Decades later, people living in those downwind areascalled "downwinders"began developing cancer at above-normal rates. In 1990, the U.S. government passed the Radiation Exposure Compensation Act. This law entitles some downwinders to payments of $50,000.

Greenhouse Gases There are five major greenhouse gases in Earth's atmosphere.

• water vapor
• carbon dioxide
• nitrous oxide

London Smog What has come to be known as the London Smog of 1952, or the Great Smog of 1952, was a four-day incident that sickened 100,000 people and caused as many as 12,000 deaths. Very cold weather in December 1952 led residents of London, England, to burn more coal to keep warm. Smoke and other pollutants became trapped by a thick fog that settled over the city. The polluted fog became so thick that people could only see a few meters in front of them.

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Water Pollution: Everything You Need to Know

Our rivers, reservoirs, lakes, and seas are drowning in chemicals, waste, plastic, and other pollutants. Here’s why—and what you can do to help.

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What is water pollution?

What are the causes of water pollution, categories of water pollution, what are the effects of water pollution, what can you do to prevent water pollution.

Water pollution occurs when harmful substances—often chemicals or microorganisms—contaminate a stream, river, lake, ocean, aquifer, or other body of water, degrading water quality and rendering it toxic to humans or the environment.

This widespread problem of water pollution is jeopardizing our health. Unsafe water kills more people each year than war and all other forms of violence combined. Meanwhile, our drinkable water sources are finite: Less than 1 percent of the earth’s freshwater is actually accessible to us. Without action, the challenges will only increase by 2050, when global demand for freshwater is expected to be one-third greater than it is now.

Water is uniquely vulnerable to pollution. Known as a “universal solvent,” water is able to dissolve more substances than any other liquid on earth. It’s the reason we have Kool-Aid and brilliant blue waterfalls. It’s also why water is so easily polluted. Toxic substances from farms, towns, and factories readily dissolve into and mix with it, causing water pollution.

Here are some of the major sources of water pollution worldwide:

Agricultural

Toxic green algae in Copco Reservoir, northern California

Aurora Photos/Alamy

Not only is the agricultural sector the biggest consumer of global freshwater resources, with farming and livestock production using about 70 percent of the earth’s surface water supplies , but it’s also a serious water polluter. Around the world, agriculture is the leading cause of water degradation. In the United States, agricultural pollution is the top source of contamination in rivers and streams, the second-biggest source in wetlands, and the third main source in lakes. It’s also a major contributor of contamination to estuaries and groundwater. Every time it rains, fertilizers, pesticides, and animal waste from farms and livestock operations wash nutrients and pathogens—such bacteria and viruses—into our waterways. Nutrient pollution , caused by excess nitrogen and phosphorus in water or air, is the number-one threat to water quality worldwide and can cause algal blooms , a toxic soup of blue-green algae that can be harmful to people and wildlife.

Sewage and wastewater

Used water is wastewater. It comes from our sinks, showers, and toilets (think sewage) and from commercial, industrial, and agricultural activities (think metals, solvents, and toxic sludge). The term also includes stormwater runoff , which occurs when rainfall carries road salts, oil, grease, chemicals, and debris from impermeable surfaces into our waterways

More than 80 percent of the world’s wastewater flows back into the environment without being treated or reused, according to the United Nations; in some least-developed countries, the figure tops 95 percent. In the United States, wastewater treatment facilities process about 34 billion gallons of wastewater per day . These facilities reduce the amount of pollutants such as pathogens, phosphorus, and nitrogen in sewage, as well as heavy metals and toxic chemicals in industrial waste, before discharging the treated waters back into waterways. That’s when all goes well. But according to EPA estimates, our nation’s aging and easily overwhelmed sewage treatment systems also release more than 850 billion gallons of untreated wastewater each year.

Oil pollution

Big spills may dominate headlines, but consumers account for the vast majority of oil pollution in our seas, including oil and gasoline that drips from millions of cars and trucks every day. Moreover, nearly half of the estimated 1 million tons of oil that makes its way into marine environments each year comes not from tanker spills but from land-based sources such as factories, farms, and cities. At sea, tanker spills account for about 10 percent of the oil in waters around the world, while regular operations of the shipping industry—through both legal and illegal discharges—contribute about one-third. Oil is also naturally released from under the ocean floor through fractures known as seeps.

Radioactive substances

Radioactive waste is any pollution that emits radiation beyond what is naturally released by the environment. It’s generated by uranium mining, nuclear power plants, and the production and testing of military weapons, as well as by universities and hospitals that use radioactive materials for research and medicine. Radioactive waste can persist in the environment for thousands of years, making disposal a major challenge. Consider the decommissioned Hanford nuclear weapons production site in Washington, where the cleanup of 56 million gallons of radioactive waste is expected to cost more than $100 billion and last through 2060. Accidentally released or improperly disposed of contaminants threaten groundwater, surface water, and marine resources.

To address pollution and protect water we need to understand where the pollution is coming from (point source or nonpoint source) and the type of water body its impacting (groundwater, surface water, or ocean water).

Where is the pollution coming from?

Point source pollution.

When contamination originates from a single source, it’s called point source pollution. Examples include wastewater (also called effluent) discharged legally or illegally by a manufacturer, oil refinery, or wastewater treatment facility, as well as contamination from leaking septic systems, chemical and oil spills, and illegal dumping. The EPA regulates point source pollution by establishing limits on what can be discharged by a facility directly into a body of water. While point source pollution originates from a specific place, it can affect miles of waterways and ocean.

Nonpoint source

Nonpoint source pollution is contamination derived from diffuse sources. These may include agricultural or stormwater runoff or debris blown into waterways from land. Nonpoint source pollution is the leading cause of water pollution in U.S. waters, but it’s difficult to regulate, since there’s no single, identifiable culprit.

Transboundary

It goes without saying that water pollution can’t be contained by a line on a map. Transboundary pollution is the result of contaminated water from one country spilling into the waters of another. Contamination can result from a disaster—like an oil spill—or the slow, downriver creep of industrial, agricultural, or municipal discharge.

What type of water is being impacted?

Groundwater pollution.

When rain falls and seeps deep into the earth, filling the cracks, crevices, and porous spaces of an aquifer (basically an underground storehouse of water), it becomes groundwater—one of our least visible but most important natural resources. Nearly 40 percent of Americans rely on groundwater, pumped to the earth’s surface, for drinking water. For some folks in rural areas, it’s their only freshwater source. Groundwater gets polluted when contaminants—from pesticides and fertilizers to waste leached from landfills and septic systems—make their way into an aquifer, rendering it unsafe for human use. Ridding groundwater of contaminants can be difficult to impossible, as well as costly. Once polluted, an aquifer may be unusable for decades, or even thousands of years. Groundwater can also spread contamination far from the original polluting source as it seeps into streams, lakes, and oceans.

Surface water pollution

Covering about 70 percent of the earth, surface water is what fills our oceans, lakes, rivers, and all those other blue bits on the world map. Surface water from freshwater sources (that is, from sources other than the ocean) accounts for more than 60 percent of the water delivered to American homes. But a significant pool of that water is in peril. According to the most recent surveys on national water quality from the U.S. Environmental Protection Agency, nearly half of our rivers and streams and more than one-third of our lakes are polluted and unfit for swimming, fishing, and drinking. Nutrient pollution, which includes nitrates and phosphates, is the leading type of contamination in these freshwater sources. While plants and animals need these nutrients to grow, they have become a major pollutant due to farm waste and fertilizer runoff. Municipal and industrial waste discharges contribute their fair share of toxins as well. There’s also all the random junk that industry and individuals dump directly into waterways.

Ocean water pollution

Eighty percent of ocean pollution (also called marine pollution) originates on land—whether along the coast or far inland. Contaminants such as chemicals, nutrients, and heavy metals are carried from farms, factories, and cities by streams and rivers into our bays and estuaries; from there they travel out to sea. Meanwhile, marine debris— particularly plastic —is blown in by the wind or washed in via storm drains and sewers. Our seas are also sometimes spoiled by oil spills and leaks—big and small—and are consistently soaking up carbon pollution from the air. The ocean absorbs as much as a quarter of man-made carbon emissions .

On human health

To put it bluntly: Water pollution kills. In fact, it caused 1.8 million deaths in 2015, according to a study published in The Lancet . Contaminated water can also make you ill. Every year, unsafe water sickens about 1 billion people. And low-income communities are disproportionately at risk because their homes are often closest to the most polluting industries.

Waterborne pathogens, in the form of disease-causing bacteria and viruses from human and animal waste, are a major cause of illness from contaminated drinking water . Diseases spread by unsafe water include cholera, giardia, and typhoid. Even in wealthy nations, accidental or illegal releases from sewage treatment facilities, as well as runoff from farms and urban areas, contribute harmful pathogens to waterways. Thousands of people across the United States are sickened every year by Legionnaires’ disease (a severe form of pneumonia contracted from water sources like cooling towers and piped water), with cases cropping up from California’s Disneyland to Manhattan’s Upper East Side.

A woman using bottled water to wash her three-week-old son at their home in Flint, Michigan

Todd McInturf/The Detroit News/AP

Meanwhile, the plight of residents in Flint, Michigan —where cost-cutting measures and aging water infrastructure created a lead contamination crisis—offers a stark look at how dangerous chemical and other industrial pollutants in our water can be. The problem goes far beyond Flint and involves much more than lead, as a wide range of chemical pollutants—from heavy metals such as arsenic and mercury to pesticides and nitrate fertilizers —are getting into our water supplies. Once they’re ingested, these toxins can cause a host of health issues, from cancer to hormone disruption to altered brain function. Children and pregnant women are particularly at risk.

Even swimming can pose a risk. Every year, 3.5 million Americans contract health issues such as skin rashes, pinkeye, respiratory infections, and hepatitis from sewage-laden coastal waters, according to EPA estimates.

On the environment

In order to thrive, healthy ecosystems rely on a complex web of animals, plants, bacteria, and fungi—all of which interact, directly or indirectly, with each other. Harm to any of these organisms can create a chain effect, imperiling entire aquatic environments.

When water pollution causes an algal bloom in a lake or marine environment, the proliferation of newly introduced nutrients stimulates plant and algae growth, which in turn reduces oxygen levels in the water. This dearth of oxygen, known as eutrophication , suffocates plants and animals and can create “dead zones,” where waters are essentially devoid of life. In certain cases, these harmful algal blooms can also produce neurotoxins that affect wildlife, from whales to sea turtles.

Chemicals and heavy metals from industrial and municipal wastewater contaminate waterways as well. These contaminants are toxic to aquatic life—most often reducing an organism’s life span and ability to reproduce—and make their way up the food chain as predator eats prey. That’s how tuna and other big fish accumulate high quantities of toxins, such as mercury.

Marine ecosystems are also threatened by marine debris , which can strangle, suffocate, and starve animals. Much of this solid debris, such as plastic bags and soda cans, gets swept into sewers and storm drains and eventually out to sea, turning our oceans into trash soup and sometimes consolidating to form floating garbage patches. Discarded fishing gear and other types of debris are responsible for harming more than 200 different species of marine life.

Meanwhile, ocean acidification is making it tougher for shellfish and coral to survive. Though they absorb about a quarter of the carbon pollution created each year by burning fossil fuels, oceans are becoming more acidic. This process makes it harder for shellfish and other species to build shells and may impact the nervous systems of sharks, clownfish, and other marine life.

With your actions

We’re all accountable to some degree for today’s water pollution problem. Fortunately, there are some simple ways you can prevent water contamination or at least limit your contribution to it:

• Learn about the unique qualities of water where you live . Where does your water come from? Is the wastewater from your home treated? Where does stormwater flow to? Is your area in a drought? Start building a picture of the situation so you can discover where your actions will have the most impact—and see if your neighbors would be interested in joining in!
• Reduce your plastic consumption and reuse or recycle plastic when you can.
• Properly dispose of chemical cleaners, oils, and nonbiodegradable items to keep them from going down the drain.
• Maintain your car so it doesn’t leak oil, antifreeze, or coolant.
• If you have a yard, consider landscaping that reduces runoff and avoid applying pesticides and herbicides .
• Don’t flush your old medications! Dispose of them in the trash to prevent them from entering local waterways.
• Be mindful of anything you pour into storm sewers, since that waste often won’t be treated before being released into local waterways. If you notice a storm sewer blocked by litter, clean it up to keep that trash out of the water. (You’ll also help prevent troublesome street floods in a heavy storm.)
• If you have a pup, be sure to pick up its poop .

With your voice

One of the most effective ways to stand up for our waters is to speak out in support of the Clean Water Act, which has helped hold polluters accountable for five decades—despite attempts by destructive industries to gut its authority. But we also need regulations that keep pace with modern-day challenges, including microplastics, PFAS , pharmaceuticals, and other contaminants our wastewater treatment plants weren’t built to handle, not to mention polluted water that’s dumped untreated.

Tell the federal government, the U.S. Army Corps of Engineers, and your local elected officials that you support water protections and investments in infrastructure, like wastewater treatment, lead-pipe removal programs, and stormwater-abating green infrastructure. Also, learn how you and those around you can get involved in the policymaking process . Our public waterways serve every one of us. We should all have a say in how they’re protected.

This story was originally published on May 14, 2018, and has been updated with new information and links.

This NRDC.org story is available for online republication by news media outlets or nonprofits under these conditions: The writer(s) must be credited with a byline; you must note prominently that the story was originally published by NRDC.org and link to the original; the story cannot be edited (beyond simple things such as grammar); you can’t resell the story in any form or grant republishing rights to other outlets; you can’t republish our material wholesale or automatically—you need to select stories individually; you can’t republish the photos or graphics on our site without specific permission; you should drop us a note to let us know when you’ve used one of our stories.

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Free Air Pollution PPT Template and Google Slides

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Environmental Pollution

Jul 19, 2014

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Environmental Pollution. Pollution Control to save the Earth. Contents. What is Environmental Pollution?. The word pollution comes from the Latin word “ pollutionem ” meaning to defile or to make dirty.

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• leaf abscission
• indoor air pollution
• various forms
• long chain phenolic chemicals
• heavy duty diesel vehicles
• nuclear hazards

Presentation Transcript

Environmental Pollution Pollution Control to save the Earth

What is Environmental Pollution? The word pollution comes from the Latin word “pollutionem” meaning to defile or to make dirty. For normal and healthy living a conducive environment is required by all the living beings, including humans, livestock, plants, micro-organisms and the wildlife. The favourable unpolluted environment has specific composition. When this composition gets changed by addition of harmful substances, the environment is called polluted environment and the substances polluting it are called pollutants. Environmental pollution can, therefore, be defined as any undesirable change in the physical, chemical or biological characteristics of any component of the environment (air, water, soil), which can cause harmful effects on various forms of life or property.

Types of Environmental Pollution Air Pollution Water Pollution Soil Pollution Marine Pollution Noise Pollution Thermal Pollution Nuclear Hazards

Types of Pollutants 1) On the basis of decomposition - A) Non degradable Pollutants • e.g., Aluminium cans, Hg, Pb, Cd , lonf chain phenolic chemicals, DDT. • They pass on from one biological system to another. • B) Bio-degradable Pollutants. • e.g., Domestic sewage 2) On the basis of nature - A) Physical pollutants: Heat, noise, radioactive pollutants B) Chemical Pollutants: Oxides of carbon, sulphur, nitrogen, different halogen gases. C) Biological pollutants: Bacteria, virus, fungi etc.

Types of Pollutants 3) On the basis of state - A) Solid particulate pollutant B) Liquid particulate pollutant: Leaked oil slicks oil sea water, dissolved solids, oils and grease C) Gaseous particulate pollutant: CFCs, SOx, NOx etc. 4) On the basis of their existence in nature - A) Quantitative pollutant: These are the substances which occur in the environment but becomes pollutant when their concentration reaches beyond a threshold value in the environment. Example: CO2, NO2 etc B) Qualitative pollutant: These are the substances which do not occur in the environment but are passed into it through human activity. Example: fungicides, herbicides, DDT etc

Types of Pollutants 5) On the basis of their of source of origin - A) Point source pollutant: When the origin source is point e.g., emissions from stack. B) Line source pollutant: transportation of material by conveyor belts, road rollers, run off seepage etc. C) Area source pollutant: When the source is an area e.g., blasting in mines

Air Pollution It is an atmospheric condition in which certain substances (including the normal constituents in excess) are present in concentrations which can cause undesirable effects on man and his environment. These substances include gases, particulatematter, radioactive substances etc. Gaseous pollutants include oxides of sulphur (mostly SO2,SO3) oxides of nitrogen mostly (NO and NO2 or NOx) carbon monoxide (CO), volatile organic compounds (mostly hydrocarbons) etc. “Particulatepollutantsincludesmoke, dust, soot, fumes, aerosols, liquiddroplets, pollen grains etc. Radioactive pollutants include Radon-222, iodine-131,strontium-90, plutonium-239 etc.

Classification of Air Pollutants 1) On the basis of decomposition - A) Non degradable Pollutants e.g. Aluminium cans, Hg, Pb, Cd , long chain phenolic chemicals, DDT. They pass on from one biological system to another. B) Bio-degradable Pollutants e.g. Domestic sewage. 2) On the basis of chemical composition - Organic pollutants e.g. Hydrocarbons, aldehydes, ketones, amines etc. B) Inorganic Pollutants e.g. Carbon compounds (CO and carbonates), sulphur compounds (H2S, SO2, H2SO4), nitrogen compounds (NOx, NH3), different halogen compounds (HF, HCl and metallic fluorides)

Classification of Air Pollutants Inorganic Particles (e.g. Fly ash, silica, asbestos and dusts from transport, mining, metallurgical and other industrial activities 3) On the basis of state of matter - A) Gaseous Pollutants Which get mixed with the air and do not normally settle out, e.g., CO, NOx and SO2 B) Particulate Pollutants Which comprise of finely divided soilds or liquids and often exist in colloidal state as aerosols, e.g., smoke, fumes, dust, mist, fog, smog and sprays

Sources of Air pollution 1) Natural sources • Natural contaminants usually present in the air are pollen, fungal spores, bacteria and marsh gas. • CO from the breakdown of methane • Volcanic eruptions • Forest fire release smoke and harmful trace gases • Salt spray from oceans • Dust storms. 2) Man-made sources • thermal power plants, industrial units, • vehicular emissions, • fossil fuel burning, • agricultural activities

Sources of Air pollution Thermal power plants have become the major sources of generating electricity in India as the nuclear power plants couldn’t be installed as planned. The main pollutants emitted are fly ash and SO2. Metallurgical plants also consume coal and produce similar pollutants. Fertilizer plants, smelters, textile mills, tanneries, refineries, chemical industries, paper and pulp mills are other sources of air pollution. Automobile exhaust is another major source of air pollution. Automobiles release gases such as carbon monoxide (about 77%), oxides of nitrogen (about 8%) and hydrocarbons (about 14%). Heavy duty diesel vehicles spew more NOx and suspended particulate matter (SPM) than petrol vehicle which produce more carbon monoxide and hydrocarbons.

Sources of Air pollution • Indoor Air Pollution • use of fuels like coal, dung-cakes, wood, kerosene in their kitchens (incomplete • combustion produces carbon monoxide. Coal contains varying amounts of sulphur which on burning produces sulphur dioxide. • Fossil fuel burning produces black soot. These pollutants i.e. CO, SO2, soot and many others like formaldehyde, benzene α pyrene (BAP) are toxic and harmful for health) • Smoking (pyrene is also found in cigarette smoke) • using wood as fuel for cooking inhales BAP (equivalent to 20 packets of cigarette a day) • radioactive Radon (Ra222) causes indoor air pollution in concrete buildings.

Effects of Air pollution 1) Effects on human health - • A) Irritation on the respiratory tract. • B) Irritation of eye, nose and throat. • C) Pb particulate cause convulsions, coma and even death • D) HF causes fluorosis and mottling of teeth • E) A variety of pollens can initiate asthmatic attack • F) Hg results in kidney, nerve and brain damage • G) Ni causes respiration damage. • H)Cd particulates through cigarrette smoking cause cardiovascular diseases , kidney and liver damage and even death.

Effects of Air pollution 2) Effects on plants - • SO2 bleaches the leaf surface and causes chlorosis • NO2 causes premature leaf fall and necrosis. • O3 damage leaves • PAN is responsible for suppressed growth, silvering of lower leaf surface • Ethylene induces leaf abscission, leaf epinasty • CO causes curling and premature falling of leaves.

Effects of Air pollution 3) Effect on climate - • Increase of CO2 • Global warming • Melting of ice, glaciers • Thinning of ozone layer • Penetration of UV rays

Effects of Air pollution 4) Effects on aquatic life – Air pollutants mixing up with rain can cause high acidity (lower pH) in fresh water lakes. This affects aquatic life especially fish. Some of the freshwater lakes have experienced total fish death. 5) Effect on materials – Because of their corrosiveness, particulates can cause damage to exposed surfaces. Presence of SO2 and moisture can accelerate corrosion of metallic surfaces. SO2 can affect fabric, leather, paint, paper, marble and limestone. Ozone in the atmosphere can cause cracking of rubber. Oxides of nitrogen can also cause fading of acetate, cotton and rayon fibres.

Control Measures of Air pollution • Air pollution can be minimized by the following methods: • · Siting of industries after proper Environmental Impact Assessment studies • · Using low sulphur coal in industries • · Removing sulphur from coal (by washing or with the help of bacteria) • · Removing NOx during the combustion process • · Removing particulate from stack exhaust gases by employing electrostatic • precipitators, bag-house filters, cyclone separators, scrubbers etc. • · Vehicular pollution can be checked by regular tune-up of engines, • replacement of old, more polluting vehicles, installing catalytic converters, • by engine modification to have fuel efficient (lean mixtures) to reduce CO • and hydrocarbon emissions and burning fuels slow and cooler to reduce • NOx emission (Honda Technology) • · Using mass transport system, bicycles etc. • · Shifting to less polluting fuels (hydrogen gas) • · Using non-conventional sources of energy • · By using biological filters and bio-scrubbers • · By planting more trees

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