Characteristics of complex air pollution in typical cities of North China

• Published in: Atmospheric and oceanic science letters = Daqi-he-haiyang-kexue-kuaibao Vol. 11; no. 1; pp. 29 - 36
• Main Authors: TANG, Bin-Yan, XIN, Jin-Yuan, GAO, Wen-Kang, SHAO, Ping, SU, Hong-Juan, WEN, Tian-Xue, SONG, Tao, FAN, Guang-Zhou, WANG, Shi-Gong, WANG, Yue-Si
• Format: Journal Article
• Language: English
• Published: Beijing Taylor & Francis 02.01.2018; KeAi Publishing Communications Ltd; KeAi Communications Co., Ltd
• Subjects: 2.5; Agglomeration; Air pollution; Beijing-Tianjin-Hebei urban agglomeration; complex air pollution; Outdoor air quality; Particulate matter; PM10; PM2.5; Summer; Suspended particulate matter; 京津冀城市群; 大气复合污染; Beijing China
• ISSN: 1674-2834; 2376-6123
• DOI: 10.1080/16742834.2018.1394158

The Beijing-Tianjin-Hebei urban agglomeration is currently facing severe complex air pollution. In this paper, simultaneous observations conducted in 2014 show that the annual mean concentration of fine particulate matter (PM 2.5 ) was 84 ± 70, 86 ± 60, and 118 ± 95 μg m −3 in Beijing, Tianjin, and Shijiazhuang, respectively. The mean O 3_8 h max in the summer was 171 ± 43, 147 ± 45, and 146 ± 44 μg m −3 , respectively. This research indicates that PM 2.5 and O 3 are positively correlated when the temperature exceeds 20 °C, and the urban agglomeration shows characteristics of complex air pollution consisting of superimposed O 3 and PM 2.5 . In summer, when the humidity was less than 55%, secondary particles and O 3 also increased in a coordinated manner (y = 1.35x + 29.85; R 2  = 0.61), which demonstrates severe complex pollution. However, the mean PM 2.5 (y) and mean O 3_8 h max (x) in summer showed a negative correlation (y = −1.3x + 245; R 2  = 0.61) in the three regions, indicating high concentrations of PM 2.5 pollution partially inhibit O 3 generation.