Abundant oxygenated volatile organic compounds and their contribution to photochemical pollution in subtropical Hong Kong

Hui, Lirong; Feng, Xiuli; Yuan, Qi; Chen, Yi; Xu, Yan; Zheng, Penggang; Lee, Shuncheng; Wang, Zhe

doi:10.1016/j.envpol.2023.122287

Cited by 4 publications

(2 citation statements)

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“…Altogether, we believe that the formation of OVOCs during atmospheric transport, local oxidation of primary VOCs sources, and mixing with primary OVOCs lead to this oxygenated VOC factor. We note that similar observations were made during winter in Hong Kong, with OVOCs representing 77% of ambient VOCs measured with a PTR-MS with traffic and biomass burning being the main contributing sources . Additionally, vehicle exhaust VOC emissions contain 15 to 50% OVOCs …”

Section: Resultssupporting

confidence: 75%

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Sources of Wintertime Atmospheric Organic Pollutants in a Large Canadian City: Insights from Particle and Gas Phase Measurements

Rivellini,

Jorga,

Wang

et al. 2024

ACS EST Air

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Although atmospheric organic pollutants have been extensively studied to elucidate summertime urban photochemical air pollution, uncertainties remain concerning the quality of wintertime air in large northern North American cities. Here, we used online mass spectrometric measurements of volatile organic compounds (VOCs) and organic aerosol (OA), combined with positive matrix factorization (PMF), to identify sources of organic pollutants in downtown Toronto, Canada during February−March 2023. In some cases, comparable PMF factors were identified for both VOCs and OA, such as from traffic, cooking, and background oxygenated sources. However, VOC PMF yielded additional information, such as a factor associated with human-related emissions of VOCs. Additionally, VOC PMF yields two traffic factors: one likely related to gasoline and one to diesel use. Despite cold and relatively dark conditions, the OA and VOC oxygenated factors both grow in intensity during the daytime, indicative of photochemical activity, whereas the traffic and cooking factors were enhanced in the morning and late evening due to the timing of vehicle use, cooking, and boundary layer effects. This study illustrates the benefits that arise from the parallel source−receptor analyses of organic gases and aerosol particles.

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Section: Resultssupporting

confidence: 75%

“…We note that similar observations were made during winter in Hong Kong, with OVOCs representing 77% of ambient VOCs measured with a PTR-MS with traffic and biomass burning being the main contributing sources. 132 Additionally, vehicle exhaust VOC emissions contain 15 to 50% OVOCs. 92…”

Section: Acs Esandt Airmentioning

confidence: 99%