For Air Quality Standards we have terms and definitions in 3 topics. The topics are Environment, Real Estate and Weather.

The level of pollutants prescribed by regulations that are not be exceeded during a given time in a defined area.
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The level of selected pollutants set by law that may not be exceeded in outside air. Used to determine the amount of pollutants that may be emitted by industry
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The maximum level which will be permitted for a given pollutant. Primary standards are to be sufficiently stringent to protect the public health. Secondary standards must protect the public welfare, including property and aesthetics.
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