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Pollution is when something is added to the environment harmful or poisonous to all living things. Smoke or dust in the air is a type of pollution . Sewage in drinking water is another type of pollution, containing germs and viruses. There are 3 kinds of pollution: water pollution, land pollution, and air pollution.
As pollution grows, ways to combat it have grown too. Solar energy and wind energy give people other ways to power their homes. When people use these alternative forms of energy, they put less carbon dioxide into the environment. 
Air pollution[change | change source]
Air can be polluted by many things. Air pollution includes poisonous gases, sulphur dioxide, nitrogen dioxide, carbon monoxide and very small particulates. Smoke and harmful gases released by fires, industries and thermal power plants cause air pollution. Using coal and wood as fuels for fire cause a lot of air pollution. Petroleum produces less pollution per tonne, but it causes a lot of pollution since a lot of it is burned globally. Air pollution may cause breathing problems such as asthma or other health problems. It also causes diseases like cancer.
Air pollution causes global warming and acid rain, which can lead to unpredictable levels of drought worldwide. This makes it difficult for the living organisms to survive.
Water pollution[change | change source]
Water pollution is the presence of harmful materials in water, such as sewage, dissolved metal, waste from farms, factories and crude oil spilled from oil tankers. The three main substances that pollute water are nitrates from fertilizers, sewage and detergents.
Activities such as bathing and washing clothes near lakes, ponds or rivers add nutrients like nitrate and phosphate into the water bodies.This leads to excessive growth of algae on the surface of water. It blocks the penetration of sunlight and air, thus reducing oxygen.
It causes harm to organisms living in water and can also harm people's health. In extreme cases, it may cause diseases like cancer.
Noise pollution[change | change source]
Noise pollution (also known as sound pollution) is harmful to the brain and hearing of all animals and humans. This includes the sound of vehicles, loud speakers, airplanes, jets, train horns etc. Noise pollution can cause ear problems or even permanent deafness, especially to older people. It also causes brain related problems.
Land pollution or Soil pollution[change | change source]
Soil pollution (also known as land pollution) is caused when man-made chemicals, such as hydrocarbons, heavy metals, and solvents, get into the soil.These chemicals come from industrial activities and from improper waste in disposal in leaky landfills. Soil pollution can cause health risks. The chemicals can produce harmful vapors, or they can contaminate water supplies underneath the polluted soil.
Plastic pollution is the accumulation of plastic products in the environment that adversely affects wildlife, wildlife habitat, or humans. It is caused because plastic takes thousands of years to decompose or mix in the earth.
Thermal pollution[change | change source]
Thermal pollution is the harmful release of heated liquid into a body of water or heat released into the air as a waste product of a business.
A common cause of thermal pollution is the use of water as a coolant by power stations and industrial manufacturers. This puts back warm water, and so raises the temperature and decreases the oxygen content of the water.
Reference[change | change source]
Diseases caused by pollution lead to the deaths of about 8.4 million people each year. "However, pollution receives a fraction of the interest from the global community. This is in part because pollution causes so many diseases that is it often difficult to draw a straight line between cause and effect.
There are many different types of pollution-related diseases, including those caused by air pollution, contaminated soil and water, sanitation and hygiene.
Environmental Diseases vs. Pollution-Related Diseases
Environmental diseases are a direct result from the environment. This includes diseases caused by substance abuse, exposure to toxic chemicals, and physical factors in the environment, like UV radiation from the sun, as well as genetic predisposition. Meanwhile, pollution-related diseases are attributed to exposure to toxins in the air, water, and soil. Therefore, all pollution-related disease are environmental diseases, but not all environmental diseases are pollution-related diseases.
Air pollution diseases
According to the World Health Organization (WHO), air pollution is linked to 7 million premature deaths. Here is a breakdown by the diseases air pollution causes:
Outdoor air pollution
Indoor air pollution
According to the Centers for Disease Control and Prevention (CDC): "Waterborne diseases are caused by pathogenic microbes that can be directly spread through contaminated water. Most waterborne diseases cause diarrheal illness [Note: not all diseases listed below cause diarrhea]. Eighty-eight percent of diarrhea cases worldwide are linked to unsafe water, inadequate sanitation or insufficient hygiene. These cases result in 1.5 million deaths each year, mostly in young children. The usual cause of death is dehydration. Most cases of diarrheal illness and death occur in developing countries because of unsafe water, poor sanitation, and insufficient hygiene. Other waterborne diseases do not cause diarrhea; instead these diseases can cause malnutrition, skin infections, and organ damage.
Main article: Waterborne diseases
Sanitation and hygiene diseases
Sources of lead poisoning/pollution include mining, smelting, manufacturing and recycling activities.
Arsenic is a naturally occurring element and can be found in food, water, or air. There are also industrial sources of arsenic, including mining and smelting. "People are exposed to elevated levels of inorganic arsenic through drinking contaminated water, using contaminated water in food preparation and irrigation of food crops, industrial processes, eating contaminated food and smoking tobacco. Long-term exposure to inorganic arsenic... can lead to chronic arsenic poisoning. Skin lesions and skin cancer are the most characteristic effects."