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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

annual average pollution

Language : PIARC Road Dictionary / English
Theme : Environment Environmental Protection
Definition : Average of the concentrations measured for each pollutant for one year. Note: usually this is for a calendar year, but some species are reported for the period April to March, known as a pollution year. This period avoids splitting a winter season between two years, which is useful for pollutants that have higher concentrations during the winter months.
Synonyms : annual mean pollution

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