Air Quality and Climate Bulletin

3 September 2021 (WMO) - The COVID-19 lockdown and travel restrictions led to a dramatic short-lived fall in emissions of key air pollutants in 2020, especially in urban areas. Many city dwellers saw blue skies instead of the pollution cloud. But the reduction was not uniformly spread across all regions or all types of pollutants. And many parts of the world still fell short of air quality guidelines, according to a new report from the World Meteorological Organization (WMO).

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