Level, distribution, variation and sources of Pb-210 in atmosphere in North China

96 aerosol samples were collected in north China and analyzed by gamma spectrometry. The activity concentrations of Pb-210 ranged from 97 to 27,955 μBq/m 3 , with average of 879, 3389 and 813 μBq/m 3 in Beijing, Changbai and Hunchun, respectively. Annual effective dose for inhabitants due inhalation varied from 0.68 to 5.94 μSv. There was a positive correlation between Pb-210 and PM 2.5 in Beijing. Seasonal variation of Pb-210 concentration was observed in Changbai and Hunchun. Analysis of their correlation with meteorological parameters could help to assess the effects of present pollutant emission and provide scientific support for prevention strategy.