The Influence of Climate Factors, Meteorological Conditions, and Boundary-Layer Structure on Severe Haze Pollution in the Beijing-Tianjin-Hebei Region during January 2013

Figure 3

Interannual variations of (a)~(e) precipitation, wind speed, temperature, relative humidity, and sunshine hours’ anomalies for the plains and mountainous sites, respectively; (f)~(h) temperature, depression of the dew point, and wind speed at 850 hPa level anomalies at Beijing (BJ) and Xingtai (XT), respectively; (i) IZ and IM; (j)~(k) the occurrences of haze at five urban sites (BJ, TJ, SJZ, BD, and XT) and a suburban site (TG); (l) mean visibility for all days and haze days and mean AOD over the BTH region in January. The climatology is calculated based on the mean in January from 1960 to 2013.

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