Short- and long-term impacts of the COVID-19 epidemic on urban PM<sub>2.5</sub> variations: Evidence from a megacity, Chengdu.

Atmos Environ (1994) · 2023 · PMC9664768 · PMID 36407874

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difference was apparentno p-value reported

The mean concentrations of all chemical components varied significantly, and the difference was apparent ( Table A3 ).

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