The novel coronavirus disease (COVID-19) spreads rapidly around the world, and has limited people's outdoor activities substantially.
Air quality is therefore expected to be improved due to reduced anthropogenic emissions. However, in some megacities it has not been improved as expected and severe haze episodes still occurred during the COVID-19 lockdown.
A research team led by Prof. SUN Yele from the Institute of Atmospheric Physics (IAP) of the Chinese Academy of Sciences analyzed six-year aerosol particle composition measurements to investigate responses of air quality to the changes in anthropogenic emissions during the COVID-19 outbreak in Beijing, China, as well as the Chinese New Year holiday effects on air pollution.
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