Air pollution occurs when harmful or excessive quantities of substances including gases, particulates, and biological molecules are introduced into Earth's atmosphere. It may cause diseases, allergies and also death of humans; it may also cause harm to other living organisms such as animals and food crops, and may damage the natural or built environment. Human activity and natural processes can both generate air pollution.
The Environmental Protection Agency (EPA) loosened regulatory compliance standards Thursday for certain sources of air pollution previously considered "major."
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Natural sources
Dust storm approaching Stratford, Texas.
Dust from natural sources, usually large areas of land with little or no vegetation
Methane, emitted by the digestion of food by animals, for example cattle
Radon gas from radioactive decay within the Earth's crust. Radon is a colorless, odorless, naturally occurring, radioactive noble gas that is formed from the decay of radium. It is considered to be a health hazard. Radon gas from natural sources can accumulate in buildings,
This is among the most dangerous actions that the Trump EPA has taken yet against public health,” John Walke, the group’s clean air director, said in a statement.
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