An inversion of fine particulate matter (PM_2.5) mass concentrations based on the air quality index (AQI) during dust prone periods in Hotan oasis, Sinkiang

Abstract. Ambient air pollution has been implicated as a major environmental problem in Urban development process. The objective of this publication is to analyse deeply the correlation coefficient of PM_2.5 and AOD and aerosol optical depth (AOD). Surface PM_2.5 observation data and AOD were investigated from March to June in 2015 and 2016. Hourly PM_2.5 data are sampled from air quality monitoring stations in Hotan oasis. The AOD data are derived from Terra and Aqua at 10 km resolution. The satellite passed the area at about 13:30 AM and 15:30 PM，respectively．By using the matched PM_2.5 and AOD data，the spatial and temporal distribution characteristics are discussed, and the correlation coefficient of PM_2.5 versus AOD are estimated. The results show that PM_2.5 mass concentration and AOD vary greatly in different pollution weather. This phenomenon may be associated with data collection time, and other meteorological factors. Regression analysis based on typical air pollution show subsection fitting effect is relatively good choice, and regression is relatively well in Hazardous and serious pollution weather. Fitting analysis is good for PM_2.5 in different level of air pollution, and sources and pollutants transmission have difference.