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16-Nov-2019 22:33

Various industrial pollutants also may be present as gases or aerosols, such as chlorine (elemental or in compounds), fluorine compounds and elemental mercury vapor.

However, temperature has a more complicated profile with altitude, and may remain relatively constant or even increase with altitude in some regions (see the temperature section, below).The concentration of water vapor (a greenhouse gas) varies significantly from around 10 ppm by volume in the coldest portions of the atmosphere to as much as 5% by volume in hot, humid air masses, and concentrations of other atmospheric gases are typically quoted in terms of dry air (without water vapor).among which are the greenhouse gases, principally carbon dioxide, methane, nitrous oxide, and ozone.The study of Earth's atmosphere and its processes is called atmospheric science (aerology).

Early pioneers in the field include Léon Teisserenc de Bort and Richard Assmann.The three major constituents of Earth's atmosphere, are nitrogen, oxygen, and argon.



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