Global warming can be attributed to greenhouse gases. Ozone depletion has been linked to Chlorofluorocarbons. There are traces of helium found in the atmosphere. The combined reflective ability of cloud cover and ground surfaces are known as inversions. 6.The troposphere is the layer of air in the 20-40 Km altitude range.
Ozone is a primary pollutant.
The amount of nitrogen dioxide in the atmosphere has decreased in the last 20 years. An oxidant is a substance that removes hydrogen from a compound. Carbon monoxide is a gray colored gas with an odor like rotten eggs. Nasal hairs play a part in cleaning air before it reaches the lungs. The beginning signs of an asthma attack include sweating and rapid pulse.