Abstract:The air pollution in China currently is characterized by high fine particulate matter (PM
2.5
) and ozone (O
3
) concentrations. Compared with single high pollution events, such double high pollution (DHP) events (both PM
2.5
and O
3
are above the National Ambient Air Quality Standards (NAAQS)) pose a greater threat to public health and environment. In 2020, the outbreak of COVID-19 provided a special time window to fur… Show more
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