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[Science Daily] COVID-19 lockdowns significantly impacting global air quality - Science Daily - 2020-06-11
COVID-19 lockdowns significantly impacting global air quality
Levels of two major air pollutants have been drastically reduced since lockdowns began in response to the COVID-19 pandemic, but a secondary pollutant -- ground-level ozone -- has increased in China, according to new research.
https://www.sciencedaily.com/releases/2020/05/200511124444.htm