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PIARC (World Road Association), founded in 1909 and comprising 125 member governments from all over the world, is the global forum for exchange of knowledge and experience on roads, road transport policies and practices. With consultative status to the Economic and Social Council of the United Nations, the Association is contributing to a stable and sustainable global development of the road and transport sector.

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Term of the Road Dictionary

exceedance

  • Language : PIARC Road Dictionary / English
  • Theme : Environment Environmental Protection
  • Definition : Concentration of an air pollutant that exceeds a standard or criteria, perhaps over a period of time. Note: for air quality standards an exceedance is a concentration greater than the standard value; for air quality bands an exceedance is a concentration greater than, or equal to, the upper band threshold.

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