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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

air quality standard

  • Language : PIARC Road Dictionary / English
  • Theme : Environment Environmental Protection
  • Definition : Concentration of a pollutant in the atmosphere which can broadly be taken to achieve a certain level of environmental quality. Note: air quality standards are based on assessment of the effects of each pollutant on human health including the effects on sensitive subgroups.

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