The temporary reduction in key air pollutants was more significant in urban areas, where offices and retail stores were forced to shut down to slow the spread of COVID-19, but the drop was not uniform across all regions. While some areas saw declines of up to 70% in average levels of nitrogen oxides, others saw small increases, according to the World Meteorological Organization’s inaugural Air Quality and Climate Bulletin.
World had brief, sharp improvements in air quality during pandemic lockdowns: UN
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