Air Pollutants Sources in Winter in Chang-Zhu-Tan Region of China

Table 2

Analysis of various trajectory paths and pollutant concentrations for December 2019 to February 2020 in Chang-Zhu-Tan.

Month	City	Track	Probability (%)	Airflow trajectories area	Average concentration of pollution (μg/m³)
					PM 2.5	PM 10	SO2	NO2	O3	CO
December 2019	Changsha	1	23	Yueyang, Xianning, Western of Wuhan, Xiaogan, Zhumadian, Jincheng	63.5	54.2	7.2	39.7	26.5	1.1
		2	57	Jiujiang, Huangshi	87.4	84.4	8.7	56.6	26.4	1.1
		3	20	Xiangtan, Shaoyang	66.5	61.0	8.7	49.3	24.4	1.1
	Zhuzhou	1	34	Yueyang, Xianning, Western of Wuhan, Xiaogan, Zhumadian, Jincheng	65.2	82.2	10.8	46.9	25.3	0.9
		2	34	Jiujiang, Huangshi	82.0	98.9	12.2	58.2	27.0	1.1
		3	32	Xiangtan, Shaoyang	99.2	121.2	17.3	59.5	23.1	1.2
	Xiangtan	1	25	Yueyang, Xianning, Western of Wuhan, Xiaogan, Zhumadian, Jincheng	66.0	70.7	7.2	42.7	23.8	0.9
		2	52	Jiujiang, Huangshi	90.8	104.1	9.8	56.8	26.9	1.0
		3	23	Xiangtan, Shaoyang	60.7	67.5	11.6	47.6	23.0	1.1
January 2020	Changsha	1	42	Central Hubei, Central Henan	45.3	34.1	4.4	26.3	33.9	1.1
		2	36	Border of northwest Hunan and Hubei, Wuhan	73.4	61.8	5.4	37.8	30.1	1.2
		3	4	Central Hunan, Border of Hunan and Guangdong, Central Guangdong	62.6	53.0	5.6	36.6	20.8	1.3
		4	18	Central Hubei, Border of Hubei and Southern Henan, Border of Henan and Anhui, Border of Shandong and Anhui, Border of Shandong and Jiangsu	49.0	35.2	3.5	14.3	46.6	1.0
	Zhuzhou	1	27	Border of Western Hunan and Jiangxi, Central and Northern of Jiangxi	66.5	76.4	8.3	42.7	20.9	1.0
		2	41	Central Hubei, Central Henan	55.1	60.9	7.5	33.2	33.2	0.9
		3	6	Central Hunan, Border of Southeast Hunan and Guangdong, Central Guangdong	93.6	122.6	10.0	47.4	21.1	1.3
		4	26	Central Hubei, Border of Hubei and Southern Henan, Border of Henan and Anhui, Border of Shandong and Anhui, Border of Shandong and Jiangsu	36.9	34.7	5.3	22.7	33.6	0.8
	Xiangtan	1	40	Border of northwest Hunan and Hubei, Eastern Hubei	72.8	75.4	8.0	41.5	26.4	1.0
		2	36	Central Hubei, Central Henan, Border of Henan and Shansi	42.3	42.5	5.6	27.9	31.6	0.8
		3	5	Central Hunan, Border of Southeast Hunan and Guangdong, Central Guangdong	83.2	92.2	7.8	47.0	17.3	1.1
		4	19	Central Hubei, Border of Hubei and Southern Henan, Border of Henan and Anhui, Border of Shandong and Anhui, Border of Shandong and Jiangsu	46.8	42.7	4.0	19.3	40.1	0.8
February 2020	Changsha	1	58	Border of northeast Hunan and Hubei, Eastern of Hubei	45.6	36.6	4.7	15.0	50.7	0.8
		2	31	Central Hunan, Border of Southeast Hunan and Guangxi, Border of Eastern Guangxi and Guangdong	36.6	39.2	6.3	23.3	41.9	1.0
		3	11	Central Hubei, Border of Western Henan and Shanxi, Border of Shanxi and Shaanxi	15.7	19.9	4.7	6.5	66.3	0.6
	Zhuzhou	1	68	Border of northeast Hunan and Hubei, Southeast of Hubei	40.8	45.8	6.2	19.7	45.4	0.6
		2	24	Central Hunan, Border of Southeast Hunan and Guangxi, Border of Eastern Guangxi and Guangdong	30.6	33.9	8.0	19.9	46.8	0.8
		3	8	Central Hubei, Border of Western Henan and Shanxi, Border of Shanxi and Shaanxi, Border of Northern Shaanxi and Inner Mongolia	11.7	19.4	5.7	9.3	60.6	0.4
	Xiangtan	1	60	Border of northeast Hunan and Hubei, Southeast of Hubei	41.7	43.9	6.1	18.3	45.1	0.7
		2	32	Central Hunan, Border of Southeast Hunan and Guangxi, Border of Eastern Guangxi and Guangdong	37.2	44.2	8.9	25.3	35.3	1.0
		3	8	Central Hubei, Border of Western Henan and Shanxi, Border of Shanxi and Shaanxi, Border of Northern Shaanxi and Inner Mongolia	11.3	17.7	4.8	8.2	58.6	0.5