Atmospheric Chemistry: What’s Really in the Air We Breathe

Earth’s air is mostly nitrogen (78%) and oxygen (21%), with tiny amounts of other gases.
Argon, carbon dioxide, and trace gases like neon and helium make up the remaining sliver.
Water vapor varies daily and plays a huge role in weather and climate.
Ozone in the upper atmosphere protects us from harmful UV radiation.
Ground-level ozone, however, is a pollutant that can damage lungs and crops.
Airborne particles—dust, pollen, soot—affect both health and cloud formation.
Human activities add chemicals like nitrogen oxides and sulfur dioxide to the air.
Greenhouse gases such as CO₂ and methane trap heat and drive climate change.
Atmospheric chemistry helps explain smog, acid rain, and air pollution.
Studying the air we breathe links chemistry, health, and the future of our planet.