How is air pollution affected by weather? Some types of pollution are worse in the summer heat, while others are worse in cold winter weather.
Resource Type: Information
Hydrocarbons are a class of chemicals that include several important gases.
Molecular nitrogen is the most abundant gas in Earth's atmosphere. Nitrogen atoms are also found in other important atmospheric gases.
Nitric oxide and nitrogen dioxide are two gases whose molecules are made of nitrogen and oxygen atoms. Nitrogen dioxide is a major air pollutant.
Oxygen is an important gas in the air we breathe. About 21% of Earth's atmosphere is oxygen.
Ozone is an unusual type of oxygen molecule. Ozone in the troposphere is harmful, while stratospheric ozone is beneficial.
This comic lets particulate matter, or aerosols, speak for themselves. It turns out that big hazards can come in small packages.
Volatile Organic Compounds (VOCs)
Good air quality is critical for maintaining life on Earth. But what is air quality and why does it change?
Resource Type: Information