Spatial distribution characteristics of air pollutants during heating season in Shenyang city

Shenyang was a representative heavily polluted industrial city in northeast China. Two types of urban area with significant spatial position difference were divided by arterial traffic as the surrounding and the core urban area. To reduce the impact of disturbing factors such as firecrackers in the traditional Chinese festivals, the observation period of the monitoring data was selected from November 1, 2015 to January 1, 2016. The data sources were picked from eight national monitoring stations and the daily average concentration of the main air pollutants that included PM
2.5
, PM
10
, SO
2
, NO
2
and O
3
. The overall analyzes of distribution characteristics of the air pollutant was shown that the principal pollutants with highest frequency were PM10, SO
2
and PM
2.5
, the average proportion was 70.36%, 14.11% and 11.89% respectively. In the contrastive analysis of the core urban area and the surrounding urban area, the principal pollutants in core urban areas was PM
10
, SO
2
and PM
2.5
, but in surrounding areas PM
10
, PM
2.5
and SO
2
, which were quite different. So the conclusion that the emission of SO
2
in the core urban areas was greatly higher than that in the surrounding urban areas was confirmed.