WHO Air quality standards worldwide 2005-2021, by pollutant

World Health Organization (WHO) Global air quality guidelines (AQG) in 2005 and 2021, by pollutant and averaging time

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Release date

September 2021

Region

Worldwide

Survey time period

2005 to 2021

Special properties

Annual and peak season is long-term exposure, while 24-hour and 8-hour is short-term exposure.

Supplementary notes

*99th percentile (i.e. 3–4 exceedance days per year). **Average of daily maximum 8-hour mean O3 concentration in the six consecutive months with the highest six-month running-average O3 concentration.

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