The government uses the Clean Air Policy Support System (CAPSS) as preliminary data to establish and implement air pollution reduction policies. Thus, the government have been carried out to improve the reliability of CAPSS. Despite the government’s efforts for reducing air pollution, a high concentration of air pollution emissions still has been occurred with a certain season. In addition, this issue gradually attracts public attention. Before Gyeonggi-do adopts the government’s air pollution reduction policy, the research on improved emissions is necessary to be preceded in terms of both temporal and spatial characteristics. This study aims to identify the characteristics of temporal and spatial emissions through improved emission data.

The improved emission and spatial emission characteristics are determined by the methods presented in the Gyeonggi-do Research (2019), while the temporal emission characteristics are determined by the Seoul Metropolitan Research (2019).

With improved emission, PM10 decreases by 18% and PM2.5 increases by 7%. By the contribution of PM10 and PM2.5 emission sources in each area, the fugitive dust has the biggest part of emission in PM10. In the case of PM2.5, fugitive dust is the largest source in all areas except the eastern area, while biomass burning shows the largest emission in the eastern area. Regional contribution of PM emissions is the biggest in each area in Hwaseong, Pyeongtaek, Goyang, and Namyangju.

Fugitive dust is the largest source in every urban characteristic. In the case of PM2.5, fugitive dust is the largest source in urban and semi-urban, while biomass burning in rural characteristic contributes the largest amount of emissions. Regional contribution of PM emissions is the largest in Ansan, Hwaseong and Yangpyeong in each urban characteristic.

Emissions of NOx, SOx, PM10 and PM2.5 in winter were lager than summer, while NH3 in summer is larger than winter. According to the result , air pollution reduction policy for PM is effective in both fugitive dust and biomass burning, and it is more effective in winter than summer.