THE CHARACTERISTICS AND POTENTIAL SOURCE AREA ANALYSIS OF PM 2.5 CONCENTRATION FOR ZHENGZHOU DURING 2016
This study used the HYSPLIT-4 model combined with cluster analysis, potential source pollution contribution functions and other methods to analyse the ground air pollution monitoring data and meteorological data in Zhengzhou during 2016. The results showed that: 1) the level of PM 2.5 reached the low value in summer. The PM 2.5 concentration reached the highest level in December and reached the lowest level in August. The daily variation characteristics of PM 2.5 concentration in different seasons were roughly the same, and it had an obviously "double-peak" structure. 2) The annual PM 2.5 concentration was positively correlated with atmospheric pressure and relative humidity. The annual PM 2.5 concentration was negatively correlated with temperature, visibility, precipitation, and wind speed. 3) In winter, the air mass trajectory that through the northern Sichuan – Gansu – Shaanxi – Hubei was polluted seriously, and the level of PM 2.5 was the highest which reached to 202.13 μg/m 3. In summer, the air mass trajectory that came from Hubei was the lowest level with the value is 40.17 μg/m 3. 4) The potential source areas located in northwest of Zhengzhou, Gansu, Hubei and Beijing-Tianjin-Hebei region in spring. The surrounding of Zhengzhou contributed to the pollution of Zhengzhou. The potential source areas appeared in Shaanxi, Sichuan, and Qinghai, the border between Ningxia and Inner Mongolia in autumn. In winter the potential source areas located in Jiangsu, Hubei, Henan, eastern of Shanxi, southern of Shanxi, Ningxia and the area of Yellow Sea, etc.