The purpose of the Pollution Index Chart is to help viewers understand what types of pollution and qualities of air or waters are safe for certain peoples, animals, and when they should be avoided. EPA has assigned a specific color to each AQI category to make it easier for people to understand quickly whether air pollution is reaching unhealthy levels in their communities. The downfall of this chart is that it does not check for every single quality within the water and is not a exact indicator of pollution in the water, it is a overall general examination of the water quality but not truly in detail enough.
The pollution index chart is not a definitive test for water quality cause there can still be many other problems in the water that this test does not check for, that may need a professional to check out with more expensive procedures.
The presence of large amounts of nutrients in water promotes the excessive growth of algae in the water. A small amount of organic pollution can be tolerable by the certain algae and fish but when there is large amount or an abundance of organic pollution it can cause many algae to disappear or die off.
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