![]() For example, the content of carbon dioxide in the natural atmosphere was 280ppm and now in the current atmosphere it is 370.0^3ppm, likewise, methane was 0.750ppm and at present, it is 1.77^4ppm, nitrous oxide was 0.270ppm and now it is 0.318^5ppm. If a pure and natural atmosphere is considered to be clean then in the present condition we cannot find a natural atmosphere because chemical contents in the atmosphere are enhanced. ![]() ![]() Greenhouse Effect PPT and PDF Free DownloadĪir Pollution PPT Presentation and PDF for Free Download The atmosphere that we have today is very much distinct when compared with the atmosphere before 1760 i.e. Well, now we have known the importance of air but due to activities of human beings contaminants are added to the air and this is known as air pollution. ![]()
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