Air Quality Revision. The Atmosphere. The Earth is surrounded by an atmosphere made up of: 78% Nitrogen 21% Oxygen 1% Argon Plus Carbon Dioxide and water vapour. Pollutants. Human activity adds CO, CO 2 , carbon, NO x and SO 2 to the atmosphere.
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(from incomplete oxidation of carbon)
(from sulfur in the fuel)
(from nitrogen in the air inside an engine)