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To study the influence of particulate matter (PM) transported fromsurrounding regions on the high PM2.5 pollution levels in Beijing, theGRAPES-CUACE model was used to simulate a serious haze episode that occurredon 6–7~December 2013. The results demonstrate the model's suitability fordescribing haze episodes throughout China, especially in theBeijing–Tianjin–Hebei (Jing–Jin–Ji) region. A very close positivecorrelation was found between the southerly wind speed over the plain to thesouth of Beijing and changes in PM2.5 in Beijing, both reaching maximumvalues at about 900 hPa, suggesting that the lower atmosphere was theprincipal layer for pollutant PM transport from its southernneighbouring region to Beijing. Duringhaze episodes, and dependent upon the period, Beijing was either a pollutionsource or sink for its surrounding area. PM input from Beijing's environs wasmuch higher than the output from the city, resulting in the most seriouspollution episode, with the highest PM2.5 values occurring from 00:00 to10:00 UTC (08:00 to 18:00 LT), 7 December 2013. PM pollutants from theenvirons of the city accounted for over 50 % of the maximum PM2.5values reached in Beijing. At other times, the Beijing area was a netcontributor to pollution in its environs

atmospheric chemistry and physics

Modeling study of PM&amp;lt;sub&amp;gt;2.5&amp;lt;/sub&amp;gt; pollutant transport across cities in China's Jing–Jin–Ji region during a severe haze episode in December 2013