Impact of COVID-19 lockdown on carbonaceous aerosols in a polluted city: Composition characterization, source apportionment, influence factors of secondary formation

Dong, Zhe; Wang, Shenbo; Sun, Jiabin; Shang, Luqi; Zhang, Ruiqin

doi:10.1016/j.chemosphere.2022.136028

Cited by 10 publications

(2 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The available NO 2 , CO, Pb, and Zn resulted from vehicle emissions, as they contribute to the formation of gasoline. Furthermore, the higher proportion of OC/EC was attributed to both combustion sources and vehicle emissions. − In factor 2, a high proportion of Ni, Zr, Cr, Sr, Fe, and Pb were identified due to industrial emissions. ,− The availability of Ni and Cr was associated with the combustion of fossil fuels or oil combustion, and the possible sources could be petrochemical, steel metallurgy, and chemical plants, while waste incineration contributes significantly to Pb, Mn, and Zn emissions during steel manufacturing . In factor 3, a high proportion of NO 2 and OC/EC was noticed which resulted from the direct combustion of coal .…”

Section: Resultsmentioning

confidence: 99%

Outdoor Health Risk of Atmospheric Particulate Matter at Night in Xi’an, Northwestern China

Ainur

Chen

Sha

et al. 2023

Environ. Sci. Technol.

View full text Add to dashboard Cite

The deterioration of air quality via anthropogenic activities during the night period has been deemed a serious concern among the scientific community. Thereby, we explored the outdoor particulate matter (PM) concentration and the contributions from various sources during the day and night in winter and spring 2021 in a megacity, northwestern China. The results revealed that the changes in chemical compositions of PM and sources (motor vehicles, industrial emissions, coal combustion) at night lead to substantial PM toxicity, oxidative potential (OP), and OP/PM per unit mass, indicating high oxidative toxicity and exposure risk at nighttime. Furthermore, higher environmentally persistent free radical (EPFR) concentration and its significant correlation with OP were observed, suggesting that EPFRs cause reactive oxygen species (ROS) formation. Moreover, the noncarcinogenic and carcinogenic risks were systematically explained and spatialized to children and adults, highlighting intensified hotspots to epidemiological researchers. This better understanding of day− night-based PM formation pathways and their hazardous impact will assist to guide measures to diminish the toxicity of PM and reduce the disease led by air pollution.

show abstract

Section: Resultsmentioning

confidence: 99%

Outdoor Health Risk of Atmospheric Particulate Matter at Night in Xi’an, Northwestern China

Ainur

Chen

Sha

et al. 2023

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Factor 5 displayed a high loading of OC1 and a considerable loading of OC2, indicative of biomass burning. OC1 and OC2 have been linked to biomass combustion in previous studies (Stanimirova et al, 2023;Cao et al, 2005;Dong et al, 2022). Factor 6 exhibited high proportions of Mg and Ca, suggesting soil dust as these elements are major constituents of the Earth's crust (An et al, 2015;Liu et al, 2022b).…”

Section: Sources Of Epfrsmentioning

confidence: 91%

Atmospheric evolution of environmentally persistent free radicals in rural North China Plain: insights into water solubility and effects on PM_2.5 oxidative potential

Yang,

Liu,

Yang

et al. 2024

Preprint

View full text Add to dashboard Cite

Abstract. Environmentally Persistent Free Radicals (EPFRs) represent a novel class of hazardous substances, posing risks to human health and the environment. In this study, we investigated the EPFRs in ambient fine, coarse, and total suspended particulate matter (PM2.5, PM10, TSP) in rural North China Plain, where local primary emissions of EPFRs were limited. We observed that the majority of EPFRs occurred in PM2.5. Moreover, distinct seasonal patterns and higher g-factors of EPFRs were found compared to those in urban environments, suggesting unique characteristics of EPFRs in rural areas. The source apportionment analyses revealed atmospheric oxidation as the largest contributor (33.6 %) to EPFRs. A large water-soluble fraction (35.2 %) of EPFRs was determined, potentially resulting from the formation of more oxidized EPFRs through atmospheric oxidation processes during long-range/regional transport. Additionally, significant positive correlations were observed between EPFRs and the oxidative potential of water-soluble PM2.5 measured by dithiothreitol-depletion and hydroxyl-generation assays, likely attributable to the water-soluble fractions of EPFRs. Overall, our findings reveal the prevalence of water-soluble EPFRs in rural areas and underscore atmospheric oxidation processes can modify their properties, such as increasing their water solubility. This evolution may alter their roles in contributing to the oxidative potential of PM2.5 and potentially also influence their impact on climate-related cloud chemistry.

show abstract

Online monitoring of carbonaceous aerosols in a northern Chinese city: Temporal variations, main drivers, and health risks

Liu,

Zhang,

Jin

et al. 2024

Atmospheric Environment

View full text Add to dashboard Cite

Impact of COVID-19 lockdown on carbonaceous aerosols in a polluted city: Composition characterization, source apportionment, influence factors of secondary formation

Cited by 10 publications

References 69 publications

Outdoor Health Risk of Atmospheric Particulate Matter at Night in Xi’an, Northwestern China

Outdoor Health Risk of Atmospheric Particulate Matter at Night in Xi’an, Northwestern China

Atmospheric evolution of environmentally persistent free radicals in rural North China Plain: insights into water solubility and effects on PM_2.5 oxidative potential

Online monitoring of carbonaceous aerosols in a northern Chinese city: Temporal variations, main drivers, and health risks

Contact Info

Product

Resources

About

Impact of COVID-19 lockdown on carbonaceous aerosols in a polluted city: Composition characterization, source apportionment, influence factors of secondary formation

Cited by 10 publications

References 69 publications

Outdoor Health Risk of Atmospheric Particulate Matter at Night in Xi’an, Northwestern China

Outdoor Health Risk of Atmospheric Particulate Matter at Night in Xi’an, Northwestern China

Atmospheric evolution of environmentally persistent free radicals in rural North China Plain: insights into water solubility and effects on PM2.5 oxidative potential

Online monitoring of carbonaceous aerosols in a northern Chinese city: Temporal variations, main drivers, and health risks

Contact Info

Product

Resources

About

Atmospheric evolution of environmentally persistent free radicals in rural North China Plain: insights into water solubility and effects on PM_2.5 oxidative potential