Spatial Characteristics Analysis for Coupling Strength among Air Pollutants during a Severe Haze Period in Zhengzhou, China.

Int J Environ Res Public Health · 2022 · PMC9325040 · PMID 35886076

Europe PMC DOI

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a decreasing trendno p-value reported

As seen from Figure 7 b, the spatial distribution of SO 2 coupling contribution in Zhengzhou presents a decreasing trend from central and southeast regions (FAHZU, BI and ZTMLC) to northwest region.

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an increasing trendno p-value reported

It is noteworthy that there is an increasing trend for the NO 2 pollution in 2016, and the contribution of NO 2 pollutants to the haze cannot be ignored.

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