Located in the eastern part of China, Jinan city is the atmospheric pollution serious areas. Large concentrations of different kinds of primary pollutants have been discharged into atmosphere from a great number of vehicles and plants. Rare and serious haze weather appeared in Jinan from Jan.19 to Feb.3, the average mass concentration of PM2.5 reached 270 �g m-3, the visibility was only 1.4 Km, the average percentage of the secondary inorganic ions in PM2.5 was 71.6%, the percentage of NO3-?SO42-?NH4+ was proportioned 18.0%?35.6% and 18.3%, respectively. Four periods of very serious haze events appeared in just half a month of time. The mass concentration of PM2.5 was in range of 400 ~ 600�g m-3, the visibility decreased less than 1Km. High concentrations of primary pollutants like SO2 and NOx had been accumulated in the urban atmosphere due to the temperature inversion and little wind environment, they could be oxidized and generated secondary inorganic aerosols in high relative humidity environment.

Haze in Jinan, China in the winter of 2013

247th National Meeting (2014)

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