Here's a little more detail:

* Gases: The most common gases in the atmosphere are nitrogen (78%), oxygen (21%), and argon (0.9%). Other important gases include carbon dioxide, neon, helium, methane, krypton, and hydrogen.

* Aerosols: These are tiny particles suspended in the air, like dust, pollen, smoke, sea salt, and volcanic ash. They can affect the atmosphere's reflectivity, cloud formation, and air quality.