Characteristics and Sources of Organic Aerosol Markers in PM2.5

Abstract

To investigate the molecular compositions, sources, and evolution processes of organic aerosols (OAs), PM2.5 samples in wintertime were collected in Jinan, a typically polluted city in the North China Plain (NCP). The concentrations of PM2.5, carbonaceous species, and organic components (e.g., sugars, fatty acids, polycyclic aromatic hydrocarbons (PAHs) and oxygenated-PAHs (OPAHs)) in haze episodes were 1.8-2.7 times higher than those in clean episodes. Levoglucosan was the most abundant saccharide, which exhibited significant correlations with carbonaceous species during the whole sampling period, demonstrating that biomass burning has an important effect on the concentrations of carbonaceous species in PM2.5 of Jinan during wintertime. The higher ratios of both secondary OC/OC (SOC/OC) and C18:1/C18:0 was observed during the clean days than those during haze days, implying that OAs during clean periods were more aged. The higher ratio of OPAHs/PAHs in the daytime reflected the more photochemical formation of OPAHs in the daytime. Positive matrix factorization (PMF) model proved that biomass burning was the major source of OAs during the whole sampling period. Potential source contribution function (PSCF) and concentration-weight trajectory (CWT) results indicating that Shandong Province and Beijing-Tianjing-Hebei (BTH) region made important contribution to the levels of PM2.5 in Jinan during the winter. Moreover, the CWT results showed that OAs during haze periods were largely originated from local and surrounding regions. These results confirmed that biomass burning can significantly influence the concentrations and chemical compositions of OAs, thereby they can affect human health and atmospheric chemistry.

Measurement Report: Investigation on the sources and formation processes of dicarboxylic acids and related species in urban aerosols before and during the COVID-19 lockdown in Jinan, East China

“…1), suggesting that the air quality was better during the LCD because of the substantial reduction in anthropogenic emissions. The haze event is defined as the daily average concentration of PM 2.5 larger than Grade II of the Chinese National Ambient Air Quality Standard (75 µg m −3 ) (Huang et al, 2014;Li et al, 2021b). Thirteen haze days before the LCD and 4 haze days during the LCD were observed in Jinan, respectively.…”

Assessment of Indoor/outdoor Particulate Matter in Residential Building: Tehran Metropolis, Iran

“…), incineration, and resuspension of road and construction dust. (Dias et al 2014;Goel and Kumar 2015;Dalmora et al 2016;Kecorius et al 2016;Abramesko and Tartakovsky 2017;Chen et al 2017;Habre et al 2018;Islam et al 2019;Stacey 2019;Moller et al 2020;Agudelo-Castaneda et al 2019;Li et al 2021). Due to the differences in air quality in different regions (like some cities in Europe, North America and China), many studies inside and outside the country have examined factors that are closely related to changes in air quality, such as meteorological conditions, changes in surface coverage, urbanization and economic development, transportation methods and urbanization (Oroji et al 2018b;Oroji et al 2019;Zhao et al 2020;Isaev et al 2022;Domhagan et al 2022).…”