After 2011, the NO 2 levels showed a decreasing trend, especially in 2012–2015.
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Satellite-Based Long-Term Spatiotemporal Trends in Ambient NO<sub>2</sub> Concentrations and Attributable Health Burdens in China From 2005 to 2020.
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After 2011, the NO 2 levels showed a decreasing trend, especially in 2012–2015.