Exceedance

Exceedance - a measured level of an air pollutant higher than the national or state ambient air quality standard
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Exceedance
Violation of the pollutant levels permitted by environmental protection standards.
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E exceedance
Definition (english only)
An event (characterised by duration and degree of exceedance) where the concentration of a pollutant is greater than, or equal to, the appropriate air quality standard.

See also: Air, Reduction, Water, Environmental, Environment