Air Quality in the Harbin-Changchun Metropolitan Area in Northeast China: Unique Episodes and New Trends.

Toxics · 2021 · PMC8707320 · PMID 34941791

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showed a trendno p-value reported

In addition, the inter-annual variation of the total non-attainment days showed a trend of fluctuating decline. 3.2.

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an increasing trendno p-value reported

The ratios of NO 2 /SO 2 and CO/SO 2 showed an increasing trend from Case 1 to Case 3.

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