- 行业: Government
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So called "pure" air is a mixture of gases containing about 78 percent nitrogen; 21 percent oxygen; less than 1 percent of carbon dioxide, argon, and other gases; and varying amounts of water vapor. See also ambient air.
Industry:Pollution control
Rain which is especially acidic (pH <5. 2). Principal components of acid rain typically include nitric and sulfuric acid. These may be formed by the combination of nitrogen and sulfur oxides with water vapor in the atmosphere.
Industry:Pollution control
Natural or synthetic chemical compounds composed of up to millions of repeated linked units, each of a relatively light and simple molecule.
Industry:Pollution control
Particles of solid or liquid matter that can remain suspended in air from a few minutes to many months depending on the particle size and weight.
Industry:Pollution control
Hybrid electric motor vehicles may operate using both electric and gasoline-powered motors. Emissions from hybrid electric motor vehicles are also substantially lower than conventionally powered motor vehicles. (See also Electric Motor Vehicle. )
Industry:Pollution control
Fuels such as methanol, ethanol, natural gas, and liquid petroleum gas that are cleaner burning and help to meet ARB's mobile and stationary emission standards. These fuels may be used in place of less clean fuels for powering motor vehicles. For more information, please visit our alternative fuels website.
Industry:Pollution control
Fuels such as coal, oil, and natural gas; so-called because they are the remains of ancient plant and animal life.
Industry:Pollution control
Degradation of air quality resulting from unwanted chemicals or other materials occurring in the air. (See also air pollutants. )
Industry:Pollution control
