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. Severe wintertime PM 2.5  pollution in Beijing has been receivingincreasing worldwide attention, yet the decadal variations remain relativelyunexplored. Combining field measurements and model simulations, wequantified the relative influences of anthropogenic emissions andmeteorological conditions on PM 2.5  concentrations in Beijing overthe winters of 2002–2016. Between the winters of 2011 and 2016, stringentemission control measures resulted in a 21 % decrease in mean massconcentrations of PM 2.5  in Beijing, with 7 fewer haze days per winteron average. Given the overestimation of PM 2.5  by the model, theeffectiveness of stringent emission control measures might have beenslightly overstated. With fixed emissions, meteorological conditions overthe study period would have led to an increase in haze in Beijing, but thestrict emission control measures have suppressed the unfavorable influencesof the recent climate. The unfavorable meteorological conditions are attributedto the weakening of the East Asia winter monsoon associated particularlywith an increase in pressure associated with the Aleutian Low.

atmospheric chemistry and physics

China's emission control strategies have suppressed unfavorable influences of climate on wintertime PM&amp;lt;sub&amp;gt;2.5&amp;lt;/sub&amp;gt; concentrations in Beijing since 2002