PANs
Peroxyacyl nitrates. Group of chemicals found in photochemical smog.
Subject:
Chapter 17 - Air and Air Pollution
inversion
See temperature inversion.
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industrial smog
Type of air pollution consisting mostly of a mixture of sulfur dioxide, suspended droplets of sulfuric acid formed from some of the sulfur dioxide, and a variety of suspended solid particles. Compare photochemical smog.
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dust plume
Elongation of a dust dome by winds that can spread a city's pollutants hundreds of kilometers downwind.
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dust dome
Dome of heated air that surrounds an urban area and traps pollutants, especially suspended particulate matter. See also urban heat island.
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buffer
Substance that can react with hydrogen ions in a solution and thus hold the acidity or pH of a solution fairly constant. See pH.
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atmosphere
Whole mass of air surrounding the earth. See stratosphere, troposphere.
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air pollution
One or more chemicals in high enough concentrations in the air to (1) harm humans, other animals, vegetation, or materials or (2) alter climate. Excess heat and noise are also considered forms of air pollution. Such chemicals or physical conditions are called air pollutants. See primary pollutant, secondary pollutant.
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acid rain
See acid deposition.
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acid deposition
The falling of acids and acid-forming compounds from the atmosphere to the earth's surface. Acid deposition is commonly known as acid rain, a term that refers only to wet deposition of droplets of acids and acid-forming compounds.
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