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An example of point source pollution is factories, in the olden days there was a common belief that if factories diluted their waste it would, make it less harmful and hence no longer be a pollutant. However this belief of theirs was wrong and is one of the main contributors to the pollution in the Great Lakes. Pulp and paper factories would dilute the chemicals used and then disperse them into the water. One of the main chemicals disposed into the lake was mercury (Hg). Even in small quantities mercury is very harmful for humans. Mercury can affect the major organ systems of a human such as their digestive, respiratory, immune system, kidney, eyes and other body part. Having this in the water that is drunken by thousands of people everyday makes it very dangerous. Another example of point source pollution is the waste being disposed from household bathrooms. This waste contains fecal matter which contains many infectious diseases such as E.Coli, Salmonella and many more, these bacterium’s are harmful for humans and if attacked by them can cause serious illness. 20% of the water tested in Lake Michigan (part of Great Lakes) was found to have human fecal matter in 2004. With the increase in population there is a high chance this number has increased and spread to other lakes as well. A study showed that many houses with this antiquated system often released partially treated or even untreated sewage directly into the lakes. The over flowed water is directly dispersed into the lake before it has a chance to be treated. This happens because the water from household(s) and water from precipitation are put through the same pipe (the large one “combined sewage”) because of this dual sewage system if there is too much precipitate the sewage overflows and this is when it overflows directly into the lake. This causes pollutants to get into the lake and harm the ecosystem residing in the lake. Nonpoint Source Pollution Unlike Point Source Pollution the source from the where the pollution is coming from is usually unknown this makes it harder to regulate. Nonpoint Source Pollution is usually from natural matters such as melted snow carrying debris, rain from floods, gravel/oil/salt flown off highways and fertilizer and pesticide residue from nearby farms. Having such diverse and uncontrollable sources has made it difficult to control making it an underlying problem even today. Air Pollution Also known as Air Deposition is the third source of pollution. Air Pollution is a type of Nonpoint Source Pollution but unlike others Air Pollution comes from the sky not land. Air Pollution is the hardest of the three to control because the pollutants are moved through air and get caught in the water cycle. They are usually released as some form of precipitation.