Temporal and Spatial Heterogeneity of PM Related to Meteorological and Socioeconomic Factors across China during 2000-2018.

In recent years, air pollution caused by PM in China has become increasingly severe. This study applied a Bayesian space-time hierarchy model to reveal the spatiotemporal heterogeneity of the PM concentrations in China. In addition, the relationship between meteorological and socioeconomic factors and their interaction with PM during 2000-2018 was investigated based on the GeoDetector model. Results suggested that the concentration of PM across China first increased and then decreased between 2000 and 2018. Geographically, the North China Plain and the Yangtze River Delta were high PM pollution areas, while Northeast and Southwest China are regarded as low-risk areas for PM pollution. Meanwhile, in Northern and Southern China, the population density was the most important socioeconomic factor affecting PM with values of 0.62 and 0.66, respectively; the main meteorological factors affecting PM were air temperature and vapor pressure, with values of 0.64 and 0.68, respectively. These results are conducive to our in-depth understanding of the status of PM pollution in China and provide an important reference for the future direction of PM pollution control.