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The Earth's AtmosphereThere are many things in the atmosphere, but basically it is made up of two different elements which are gases. Measured by volume (not weight) completely dry air contains approximately 78% nitrogen and 21% oxygen with about 1% of everything else. The extra 1% or so of total air content consists of many different things. It is mostly argon plus small amounts of carbon dioxide and a number of other gases. However, air is not normally dry so you have to factor in an average of about 1% or more of water vapor. In addition to those things, air also contains dust, pollen, spores, ash, and various chemical pollutants. If you consider the air by mass or weight instead of volume then some of those gases like water vapor and carbon dioxide which are heavier would consist of a larger percentage of the air. The same would be true of particles and other pollutants in the air.
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