Abstract
Urban air quality, which is related to the health of local residents of the Pearl River Delta Region, China, (PRD) has been a hot topic among the masses and academic circles. In addition to economic growth, China’s rapidly increasing urbanization rate has also brought great pressure on urban air quality, in the Region, where due to its huge economic size and population, urban air quality has become the focus of local residents. This study first analyzed the spatio-temporal trends and correlation of land use and PM2.5 average annual concentration, which represents air quality in the PRD from 2000 to 2018, and according to Moran index, PM2.5 concentration in this area has spatial correlation in the study time. Secondly, the spatial error model of the PRD was constructed by using spatial effect, spatial modeling theory and spatial model estimation. The spatial-temporal evolution and influencing factors of PM2.5 concentration were discussed in fixed overall effect. The results showed that the area of cultivated land in the PRD decreased and the area of artificial surface increased year by year, while the PM2.5 concentration increased first and then decreased. In addition, the area of cultivated land and forestland were negatively correlated, while the area of grassland and water body were positively correlated with PM2.5 concentration. The conclusion of this study has a certain theoretical reference for urban land use planning and air quality assurance.
Highlights
China’s urbanization rate has risen from 10 percent in 1949 to more than 60 percent by the end of 2020
Lin et al (2020) took Jiangsu Province in the Yangtze River Delta of China as the research object, and explored the influence of land use on PM2.5 concentration and removal, and the results showed that forest land and industrial land had a greater influence on PM2.5 concentration than other land use types
The problem of urban air quality is closely related to the health of local residents, which has been widely concerned by the masses and scholars
Summary
China’s urbanization rate has risen from 10 percent in 1949 to more than 60 percent by the end of 2020. The rapid growth of urbanization has brought about great changes in China’s land use pattern. The problem of air pollution has posed a huge threat to the public health in Chinese cities (Yuan et al, 2018; Chen et al, 2020), which has become the focus of. PM2.5 refers to airborne particles with an aerodynamic diameter of less than 2.5 μm, This has posed serious threats to human health and the atmospheric environment (Hao and Liu, 2016). As PM2.5 pollution is getting more and more serious in China, at the end of December 2012, the PM2.5 concentration of each city began to be published in real time, and the new ambient air quality standards were released, adding PM2.5 as a routine monitoring index. Spatio-temporal evolution of urban air quality and its influencing factors were discussed in three dimensions of fixed time effect, fixed individual effect and fixed total effect
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