Corona virus disease-19 (COVID-19) has substantially reduced human activities and the associated anthropogenic emissions. This study quantifies the effects of COVID-19 control measures on six major air pollutants over 68 cities in North China by a Difference in Relative-Difference method that allows estimation of the COVID-19 effects while taking account of the general annual air quality trends, temporal and meteorological variations, and the spring festival effects. Significant COVID-19 effects on all six major air pollutants are found, with NO having the largest decline (-39.6%), followed by PM (-30.9%), O (-16.3%), PM (-14.3%), CO (-13.9%), and the least in SO (-10.0%), which shows the achievability of air quality improvement by a large reduction in anthropogenic emissions. The heterogeneity of effects among the six pollutants and different regions can be partly explained by coal consumption and industrial output data.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7995075 | PMC |
| http://dx.doi.org/10.1002/env.2673 | DOI Listing |
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