Quantifying coal power plant responses to tighter SO<sub>2</sub> emissions standards in China.

Proc Natl Acad Sci U S A · 2018 · PMC6142229 · PMID 29915085

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a clear trendno p-value reported

There is a clear trend of reductions in SO 2 concentrations before the July 2014 compliance deadline, and the decline persists after the deadline.

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