Source apportionment of consumed volatile organic compounds in the atmosphere

• Published in: Journal of hazardous materials 2023-10, Vol.459, p.132138-132138, Article 132138
• Main Authors: Gu, Yao, Liu, Baoshuang, Meng, He, Song, Shaojie, Dai, Qili, Shi, Laiyuan, Feng, Yinchang, Hopke, Philip K.
• Format: Article
• Language: English
• Subjects: aerosols; combustion; Consumed VOCs; evaporation; gasoline; Ozone; Photochemical loss; photochemistry; PMF; pollution; pollution control; solvents; Source apportionment; volatile organic compounds
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2023.132138

Conventional source apportionments of ambient volatile organic compounds (VOCs) have been based on observed and initial concentrations after photochemical correction. However, these results have not been related to ozone (O3) and secondary organic aerosol (SOA) formation. Thus, the apportioned contributions could not effectively support secondary pollution control development. Source apportionment of the VOCs consumed in forming O3 and SOA is needed. A consumed VOC source apportionment approach was developed and applied to hourly speciated VOCs data from June to August 2022 measured in Laoshan, Qingdao. Biogenic emissions (56.3%), vehicle emissions (17.2%), and gasoline evaporation (9.37%) were the main sources of consumed VOCs. High consumed VOCs from biogenic emissions mainly occurred during transport from parks to the southwest and northwest of study site. During the O3 pollution period, biogenic emissions (46.3%), vehicle emissions (24.2%), and gasoline evaporation (14.3%) provided the largest contributions to the consumed VOCs. However, biogenic emissions contribution increased to 57.1% during the non-O3 pollution period, and vehicle emissions and gasoline evaporation decreased to 16.5% and 9.01%, respectively. Biogenic emissions and the mixed source of combustion sources and solvent use contributed the most to O3 and SOA formation potentials during the O3 pollution period, respectively. [Display omitted] •A consumed VOC source apportionment approach was developed.•Alkenes contributed 93.3% to the total VOCs photochemical loss.•Photochemical losses could lead to the loss of the impact of some key sources.•Biogenic and vehicle emissions were the main contributors to the consumed VOCs.