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《Environmental Science & Technology》 2018-06
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Pollution Characteristics of Particulate Matters and a Dust Storm Episode in the Spring of Tianjin

SUN Ren;CHEN Guanyi;DONG Haiyan;Tianjin University;Tianjin Environmental Protection Bureau;Tianjin Environmental Monitoring Center;  
The characteristics of particulate matter in spring in Tianjin were analyzed based on the air quality data and meteorological observation data during 2013-2016, combined with the back trajectory model analysis. It was shown that the dominant winds were from the southwest in spring and the highest wind speeds occurred during March to April with the average value of 3.8 m/s. High PM_(10) concentration always occurred when the wind speed was lower than 2 m/s and relative humidity was higher than 50%, and also occurred when the wind speed was higher than 6 m/s and the relative humidity was between40% and 50%. The average PM_(2.5)/PM_(10) ratio in spring decreased from 0.60 in 2013 to 0.54 in 2016, indicating of the more important influence of coarse particulate. The dust influence index increased from 1.17 to 1.95, with high value in the central and the east Binhai New Area. The typical dust pollution episode during March 5 th to 7 th, 2016 was analyzed and the result showed that secondary dust also contributed to PM_(10) during the dust transport process.
【Fund】: 国家科技支撑计划(2014BAC23B01 2014BAC23B03 2014BAC06B04);; 天津市科技计划项目(15YFYSSF00030)
【CateGory Index】: X513
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