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Journal of Geographical Sciences    2018, Vol. 28 Issue (5) : 563-578     DOI: 10.1007/s11442-018-1491-z
Research Articles |
Spatiotemporal characteristics of urban air quality in China and geographic detection of their determinants
ZHANG Xiaoping(),GONG Zezhou
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
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Abstract  

Ambient air pollution brought by the rapid economic development and industrial production in China has exerted a significant influence on socio-economic activities and public health, especially in the densely populated urban areas. Therefore, scientific examination of regional variation of urban air quality and its dominant factors is of great importance to regional environmental management. Based on daily air quality index (AQI) datasets spanning from 2014 to 2016, this study analysed the spatiotemporal characteristics of air quality across different regions throughout China and ascertained the determinants of urban air quality in disparate regions. The main findings are as follows: (1) The annual average value of the urban AQI in China decreased from 2014 to 2016, indicating a desirable trend in air quality at the national scale. (2) The attainment rate of the urban AQI exhibited an apparent spatially stratified heterogeneity, wherein North China retained a high AQI value. The increase of Moran’s I Index reported an apparent spillover effect among adjacent regions. (3) Both at the national and regional scales, the seasonal tendency of air quality in each year is similar, wherein good in summer and relatively poor in winter. (4) Results drawn from the Geographic Detector analysis show that dominant factors influencing AQI vary significantly across urban agglomerations. Topographical and meteorological variations in urban areas may lead to complex spatiotemporal variations in pollutant concentration. Whereas given the same natural conditions, the human-dominated factors, such as industrial structure and urban form, exert significant impacts on urban air quality.The spatial spillover effects and regional heterogeneity of urban air quality illustrated in this study suggest the governments and institutions should set priority to the importance of regional cooperation and collaboration in light of environment regulation and pollution prevention.

Keywords Air Quality Index (AQI)      spatiotemporal characteristics      geographic detector      China     
Fund:National Natural Science Foundation of China, No.41771133;Science and Technology Service (STS) Program of Chinese Academy of Sciences, No.KFJ-EW-STS-089
Issue Date: 31 March 2018
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ZHANG Xiaoping
GONG Zezhou
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ZHANG Xiaoping,GONG Zezhou. Spatiotemporal characteristics of urban air quality in China and geographic detection of their determinants[J]. Journal of Geographical Sciences, 2018, 28(5): 563-578.
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http://www.geogsci.com/EN/10.1007/s11442-018-1491-z     OR     http://www.geogsci.com/EN/Y2018/V28/I5/563
Figure 1  The location of the study area (a) and sample cities (b)
Figure 2  The daily AQI average of sample cities in China in 2014, 2015, and 2016
Figure 3  The spatial distribution of the attainment rate for the annually averaged AQI in China
Figure 4  Global autocorrelation of AQI for China in 2014, 2015, and 2016
Figure 5  Spatial agglomeration variation of annual AQI in China
Region Province Number of city (2014) Number of city (2015 and 2016)
A Nationwide 161 366
B Heilongjiang, Jilin, Liaoning 16 37
C Beijing, Tianjin, Hebei 13 13
D Shanghai, Jiangsu, Zhejiang 25 39
E Hubei, Hunan, Anhui, Jiangxi 14 54
F Guangdong, Guangxi, Fujian, Hainan 30 46
G Sichuan, Guizhou, Yunnan, Chongqing, Tibet 15 54
H Gansu, Shaanxi, Qinghai, Ningxia, Xinjiang, Inner Mongolia 19 65
I Shandong, Shanxi, Henan 29 58
Table 1  Description of regional divisions in China
Figure 6  Monthly variations of AQI among different regions of China for 2014, 2015, and 2016
Figure 7  Determinants diagram of urban air quality
Indices First-grade Second-grade Third-grade Fourth-grade Fifth-grade
X1 (104 per) <200 200-400 400-700 700-1000 >1000
X2 (%) <4 4-10 10-18 18-33 >33
X3 (104 yuan) <3 3-5 5-7.5 7.5-12 >12
X4 (102) <7 7-15 15-25 25-45 >45
X5 (102 hm2) <15 15-25 25-40 40-80 >80
X6 (103 t) <19 19-23 23-42 42-130 >130
X7 (104 t) <3 3-6 6-10 10-16 >16
X8 (°) <0.1 0.1-0.5 0.5-1.5 1.5-3.5 >3.5
X9 (%) <50 50-60 60-70 70-75 >75
X10 (102 mm) <4.5 4.5-7.5 7.5-10 10-15 >15
X11 (m/s) <1.4 1.4-1.8 1.8-2.2 2.2-2.6 >2.6
X12 (℃) <7 7-11 11-15 15-19 >19
Table 2  Impact factor partitions for the identified geographical factors
Figure 8  Spatial distribution of the 12 detected factors
X1 X2 X3 X4 X5 X6 X7 X8 X9 X10 X11 X12
X1
X2 N
X3 N N
X4 N N N
X5 N N N N
X6 N N N N N
X7 N N Y N N N
X8 N N N N N N N
X9 N N Y N N N N N
X10 Y Y Y Y Y Y N Y N
X11 N N N N N N N N N N
X12 Y Y Y Y Y Y Y Y Y N Y
Table 3  Significance test of different factors affecting the urban AQI in China (Region A)
Factors P value
A B C D E F G H I
X1 0.1228 0.2636 0.4115 0.2606 0.1194 0.1440 0.2166 0.0907 0.1765
X2 0.1312 0.3477 0.0736 0.1213 0.1568 0.1759 0.1716 0.0448 0.1071
X3 0.0298 0.5177 0.4911 0.1972 0.0688 0.0830 0.1973 0.1315 0.1514
X4 0.1272 0.2982 0.8172 0.5873 0.1350 0.1104 0.1298 0.0447 0.4137
X5 0.1307 0.2824 0.3109 0.2576 0.0771 0.0421 0.5025 0.1660 0.2235
X6 0.1599 0.3471 0.3368 0.4776 0.0162 0.0134 0.0924 0.1616 0.0491
X7 0.1889 0.4813 0.1442 0.3482 0.0182 0.2016 0.0981 0.0888 0.0450
X8 0.1315 0.0705 0.2278 0.1232 0.1490 0.0442 0.4818 0.0145 0.2327
X9 0.2168 0.2764 0.2746 0.2559 0.1084 0.0067 0.3129 0.0231 0.1483
X10 0.2943 0.3289 0.0397 0.6956 0.1880 0.0592 0.4749 0.0575 0.0148
X11 0.1016 0.0562 0.2641 0.2289 0.1782 0.3815 0.4509 0.2087 0.2351
X12 0.3436 0.2479 0.7128 0.0077 0.1507 0.0450 0.3834 0.0365 0.1590
Table 4  Geographically determined weights of the factors affecting the urban AQI in the study area
Region Factors P value Factors P value Factors P value
A X12 0.3436 X10 0.2943 X9 0.2168
B X3 0.5177 X7 0.4813 X2 0.3477
C X4 0.8172 X12 0.7128 X3 0.4911
D X10 0.6956 X4 0.5873 X6 0.4776
E X10 0.1880 X11 0.1782 X2 0.1568
F X11 0.3815 X7 0.2016 X2 0.1759
G X5 0.5025 X8 0.4818 X10 0.4749
H X11 0.2087 X5 0.1660 X6 0.1616
I X4 0.4137 X11 0.2351 X8 0.2327
Table 5  The top three factors affecting the urban AQI for individual regions
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