Abstract
Air quality issue such as particulate matter pollution (PM2.5 and PM10) has become one of the biggest environmental problem in China. As one of the most important industrial base and economic core regions of China, Northeast China is facing serious air pollution problems in recent years, which has a profound impact on the health of local residents and atmospheric environment in some part of East Asia. Therefore, it is urgent to understand temporal-spatial characteristics of particles and analyze the causality factors. The results demonstrated that variation trend of particles was almost similar, the annual, monthly and daily distribution had their own characteristics. Particles decreased gradually from south to north, from west to east. Correlation analysis showed that wind speed was the most important factor affecting particles, and temperature, air pressure and relative humidity were key factors in some seasons. Path analysis showed that there was complex unidirectional causal relationship between particles and individual or combined effects, and NO2 and CO were key factors affecting PM2.5. The hot and cold areas changed little with the seasons. All the above results suggests that planning the industrial layout, adjusting industrial structure, joint prevention and control were necessary measure to reduce particles concentration.
Highlights
Air quality issue such as particulate matter pollution (PM2.5 and PM10) has become one of the biggest environmental problem in China
Chinese government has established air quality monitoring stations in many cities to monitor pollutants mass concentration, published the relative observed data online from January 2013. These air quality data played an important role on analyzing local air pollution situation and establishing air pollutant mass concentration prediction model[17]
(2) Particulate matter concentration closely related to meteorological conditions
Summary
Air quality issue such as particulate matter pollution (PM2.5 and PM10) has become one of the biggest environmental problem in China. As previous studies have shown, pollutants sources emission, external transport, meteorological conditions and secondary generation of air pollution were important factors influencing atmospheric particulate matter mass concentration. Yang et al pointed out that it played a crucial role of interaction between PM2.5 and meteorological factors on analyzing air pollution in 68 major cities and 7 geographical regions in China, and meteorological factors included relative humidity, surface pressure, wind speed and temperature, the relationship between meteorological factors with PM2.5 has spatial and seasonal variations[26]. There are still great uncertainties about the temporal and spatial distribution of atmospheric particulate matter, possible influencing factors and quantify the source contributions to PM2.5, because different cities have different urban human characteristics and natural environmental factors, there is no unified conclusion on the causes of haze. This paper uses path analysis to analyze the direct and indirect effects of a series of explanatory variables, to better analyze the potential variables affecting the particle mass concentration and better describe the complex relationship with particles[36]
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