Satellite-Based Spatiotemporal Trends in PM2.5 Concentrations: China, 2004-2013.

Environ Health Perspect · 2016 · PMC4749081 · PMID 26220256

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a negative trendno p-value reported

The PM 2.5 level remained relatively constant in the Pearl River delta from 2004–2007, followed by a negative trend of 1.53 μg/m 3 per year after 2008 ( Figure 7D ).

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