- 期刊
- OpenAccess
Impact of Relative Humidity and Water Soluble Constituents of PM2.5 on Visibility Impairment in Beijing, China
並列摘要
Beijing has been experiencing severe particulate pollution accompanying the fast growing population and economy. This study investigated the impact of PM2.5 and its water soluble organic and inorganic constituents on visual impairment in Beijing under different meteorological conditions. According to the analysis of PM2.5 samples collected in Spring 2012, water soluble species took up 38.1% of PM2.5 mass, among which NO3^- was the most abundant constituent, followed by SO4^(2-), NH4^+ and water soluble organic matter. The correlation analysis between visibility and aerosol loadings as well as meteorological parameters revealed the dominant impact of meteorological conditions, relative humidity in particular, on visibility impairment over the mass concentration of PM2.5. Compared to the total aerosol loading of PM2.5, visibility was better correlated with the total mass of water soluble constituents (WSC). The visual range in Beijing was the most sensitive to both WSC and PM2.5 in the RH range of 30-70%. Severe visual impairment was observed for RH ≥ 70% with the least sensitivity to WSC and PM2.5. The effects of synoptic scale circulation on meteorological variables that affect air quality were also examined with the movement of a cold front as a case study. The findings have direct implications to region-wide policy-making and control strategies.
延伸閱讀
- Xu, K., Cui, K., Young, L. H., Wang, Y. F., Hsieh, Y. K., Wan, S., & Zhang, J. (2020). Air Quality Index, Indicatory Air Pollutants and Impact of COVID-19 Event on the Air Quality near Central China. Aerosol and Air Quality Research, 20(6), 1204-1221. https://doi.org/10.4209/aaqr.2020.04.0139
- Zhang, J., Cui, K., Wang, Y. F., Wu, J. L., Huang, W. S., Wan, S., & Xu, K. (2020). Temporal Variations in the Air Quality Index and the Impact of the COVID-19 Event on Air Quality in Western China. Aerosol and Air Quality Research, 20(7), 1552-1568. https://doi.org/10.4209/aaqr.2020.06.0297
- Wang, W., Shao, L., Guo, M., Hou, C., Xing, J., & Wu, F. (2017). Physicochemical Properties of Individual Airborne Particles in Beijing during Pollution Periods. Aerosol and Air Quality Research, 17(12), 3209-3219+ap1-1. https://doi.org/10.4209/aaqr.2017.03.0116
- Guan, Y., Zhang, Y., Zhang, Y., Wang, X., Han, J., Song, W., Hou, L., & Duan, E. (2020). Pollution Characteristics and Key Reactive Species of Volatile Organic Compounds in Beijing-Tianjin-Hebei Area, China. Aerosol and Air Quality Research, 20(9), 1886-1897. https://doi.org/10.4209/aaqr.2019.11.0595
- Zhang, S., Du, R., Chen, H., Ren, W., & Du, P. (2019). Seasonal Variation of Microbial Activity and Pathogenic Bacteria under Non-serious Pollution Levels in Beijing. Aerosol and Air Quality Research, 19(8), 1798-1807+ap1-4. https://doi.org/10.4209/aaqr.2019.05.0256