4.3 Article

Spatiotemporal Characteristics of Air Quality across Weifang from 2014-2018

Publisher

MDPI
DOI: 10.3390/ijerph16173122

Keywords

air quality index; primary pollutants; temporal characteristics; spatial characteristics; Weifang

Funding

  1. National Key Research and Development Program of China [2018YFB2100700]
  2. National Natural Science Foundation of China [41871375]

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Air pollution has become a severe threat and challenge in China. Focusing on air quality in a heavily polluted city (Weifang Cty), this study aims to investigate spatial and temporal distribution characteristics of air pollution and identify the influence of weather factors on primary pollutants in Weifang over a long period from 2014-2018. The results indicate the annual Air quality Index (AQI) in Weifang has decreased since 2014 but is still far from the standard for excellent air quality. The primary pollutants are O-3 (Ozone), PM10 (Particles with aerodynamic diameter <= 10 mu m), and PM2.5 (Particles with aerodynamic diameter <= 10 mu m); the annual concentrations of PM10 and PM2.5 show a significant reduction but that of O-3 is basically unchanged. Seasonally, PM10 and PM2.5 show a U-shaped pattern, while O-3 exhibits inverted U-shaped variations, and different pollutants also present different characteristics daily. Spatially, O-3 exhibits a high level in the central region and a low level in the rural areas, while PM10 and PM2.5 are high in the northwest and low in the southeast. Additionally, the concentration of pollutants is greatly affected by meteorological factors, with PM2.5 being negatively correlated with temperature and wind speed, while O-3 is positively correlated with the temperature. This research investigated the spatiotemporal characteristics of the air pollution and provided important policy advice based on the findings, which can be used to mitigate air pollution.

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