Heavy haze pollution during the COVID-19 lockdown in the Beijing-Tianjin-Hebei region, China.

J Environ Sci (China) · 2022 · PMC8748337 · PMID 35459482

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a decreasing trendno p-value reported

When PM 2.5 concentration was higher than 100 μg/m 3 , there was little difference for the proportion of SO 4 2− , but the percentage of NO 3 − shows a decreasing trend with the increase of PM 2.5 concentration ( Fig. 4 a ).

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