Day and night variations in aerosol properties and particulate matter in Changchun, China

Changchun is a city in Northeast China influenced by diverse aerosol sources and particulate matter (PM), including emissions from industrial activities, traffic, biomass burning, and mineral dust transport from deserts in the West. The aerosol property data are now accessible through the newly installed sun-sky-lunar CE318-T photometer. We are monitoring the PM1, PM2.5, and PM10 levels in two city regions in situ using the AirVisual sensors. This study analyses day and night observations from AERONET and AirVisual sensors. Key aerosol properties, such as aerosol optical depth (for total, coarse, and fine modes), Angstrom Exponent, and particle size distribution, are analyzed for different times of the day. Additionally, the concentrations of PM1, PM2.5, and PM10 during daytime and nighttime are evaluated to identify daily patterns in aerosol behavior. The findings reveal temporal variations in aerosol composition that reflect changes in atmospheric conditions, differences between outdoor-indoor concentrations, and shifts in their sources. These results provide insights into the dynamics of atmospheric aerosols, highlighting their impact on air quality and regional climate during both day and night. This comprehensive analysis contributes to a deeper understanding of aerosol behavior and its environmental implications.