Long-term characteristics of criteria air pollutants in megacities of Harbin-Changchun megalopolis, Northeast China: Spatiotemporal variations, source analysis, and meteorological effects. (December 2020)

• Record Type: Journal Article
• Authors: Li, Bo; Shi, Xiao-fei; Liu, Yu-ping; Lu, Lu; Wang, Guo-liang; Thapa, Samit; Sun, Xia-zhong; Fu, Dong-lei; Wang, Kun; Qi, Hong
• Is Part Of: Environmental pollution. Volume 267(2020)
• Publication Date: 2020-12
• Subjects: Criteria air pollutants -- Spatiotemporal variations -- Individual meteorological factors -- Convergent cross-mapping (CCM) -- Northeast China; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2020.115441
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: The hourly concentration of six criteria air pollutants in the Harbin-Changchun region were used to investigate the status and spatiotemporal variation of target air pollutants and their relationships with meteorological factors. The annual concentrations of particulate matters during 2013–2017 were two times higher than the Chinese Ambient Air Quality Standards (CAAQS) Grade Ⅱ. The annual O3 concentration increased by two times during 2013–2018 in Harbin. The concentration of PM, SO2, NO2, and CO depicted a similar seasonal trend with an order of winter > autumn > spring > summer. The consistent interannual variation trends of PM2.5 /CO, NO2 and SO2 indicated that the formation of secondary inorganic aerosols in the annual scale was dominated by the concentrations of NO2 and SO2 . The interannual variations of the individual meteorological factors causing on PM2.5 and O3 during 2013–2018 varied significantly in seasonal scale. The interannual variations were stable in annual scale indicating that the continuous decline of PM2.5 during 2014–2018 can be attributed to the comprehensive and strict prohibition of small coal-fired boilers and straw burning in the study area. Meanwhile, the increase in O3 during 2013–2018 in the study area were mainly attributed to the rapid growth of the emission of its precursor (VOCs and NOx). The influence of meteorology on PM2.5 and ozone were the most stable and strongest in winter than that in the other three seasons. Graphical abstract: Image 1 Highlights: The annual O3 concentration has increased by two times during 2013–2018 in Harbin. The dominant source of SO2 was attributed to the point sources. Strongest influence of meteorology on PM2.5 /O3 was found in winter. Temperature was the key factor with strong influence on air pollutants. Abstract : The characteristics of criteria air pollutants and their causal relationship with individual meteorological factors were comprehensively understood.