Changes in stoichiometric characteristics of ambient air pollutants pre-to post-COVID-19 in China.

Environ Res · 2022 · PMC8800168 · PMID 35101403

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a decreasing trendno p-value reported

(2021) found a decreasing trend of atmospheric pollutants during this “time window” and 2019 based on the atmospheric quality index (AQI) and atmospheric pollutants in Beijing-Tianjin-Hebei (BTH).

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showed a trendno p-value reported

The correlation between ratios Compared with different periods, PM 2.5 /PM 10 showed a trend of increasing first and then decreasing with the continuous decrease of NO 2 /SO 2 ( Fig. 5 a).

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