Troposphere
The transitional area between the troposphere and stratosphere is called the tropopause. The troposphere is made up of approximately 78% nitrogen, 21% oxygen, and 1% other gases, which include carbon dioxide, methane, neon, krypton, argon, helium, and hydrogen. The air in the troposphere is warmest closest to the earth and colder at higher elevations. Most of the dust particles in the earth's atmosphere are found in the troposphere.