(n) (geology) the probability that an earthquake will generate a level of ground motion that exceeds a specified reference level during a given exposure time

Violation of the pollutant levels permitted by environmental protection standards.

Violation of the pollutant levels permitted by environmental protection standards.

When the measured level of a contaminant is greater than the level set by a standard or limit, an exceedance is said to have occurred. Contamination at a level that exceeds the limit for that contaminant.

A violation (according to DEQ policy) of the pollutant levels permitted by water quality criteria.

Violation of the pollutant levels permitted by environmental protection standards.

A measured level of an air pollutant higher than the national or state ambient air quality standards

A measurement of air pollution that exceeds the level designated to be safe by the Federal Clean Air Act in any given hour or on any given day.

A concentration of an air pollutant that exceeds a standard or criteria

a measured level of an air pollutant higher than the national or state ambient air quality standard

violation of environmental protection standards by exceeding allowable limits or concentration levels.

In the US, a measured level of an air pollutant higher than the National Ambient Air Quality Standards (NAAQS) set by the Environmental Protection Agency (EPA). The violation of a national ambient air quality standard is based on years of data, so monitoring an exceedance does not necessarily mean that a violation of the standard has occurred.