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Photochemical oxidation of VOCs and their source impact assessment on ozone under de-weather conditions in Western Taiwan.
- Source :
-
Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2024 Apr 01; Vol. 346, pp. 123662. Date of Electronic Publication: 2024 Feb 26. - Publication Year :
- 2024
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Abstract
- The application of statistical models has excellent potential to provide crucial information for mitigating the challenging issue of ozone (O <subscript>3</subscript> ) pollution by capturing its associations with explanatory variables, including reactive precursors (VOCs and NO <subscript>X</subscript> ) and meteorology. Considering the large contribution of O <subscript>3</subscript> in degrading the air quality of western Taiwan, three-year (2019-2021) hourly concentration data of VOC, NO <subscript>X</subscript> and O <subscript>3</subscript> from 4 monitoring stations of western Taiwan: Tucheng (TC), Zhongming (ZM), Taixi (TX) and Xiaogang (XG), was evaluated to identify the effect of anthropogenic emissions on O <subscript>3</subscript> formation. Owing to the high-ambient reactivity of VOCs on the underestimation of sources, photochemical oxidation was assessed to calculate the consumed VOC (VOC <subscript>cons</subscript> ) which was followed by the source identification of their initial concentrations. VOC <subscript>cons</subscript> was observed to be highest in the summer season (16.7 and 22.7 ppbC) at north (TC and ZM) and in the autumn season (17.8 and 11.4 ppbC) in southward-located stations (TX and XG, respectively). Results showed that VOCs from solvents (25-27%) were the major source at northward stations whereas VOCs-industrial emissions (30%) dominated in south. Furthermore, machine learning (ML): eXtreme Gradient Boost (XGBoost) model based de-weather analysis identified that meteorological factors favor to reduce ambient O <subscript>3</subscript> levels at TC, ZM and XG stations (-67%, -47% and -21%, respectively) but they have a major role in accumulating the O <subscript>3</subscript> (+38%) at the TX station which is primarily transported from the upwind region of south-central Taiwan. Crucial insights using ML outputs showed that the finding of the study can be utilized for region-specific data-driven control of emission from VOCs-sources and prioritized to limit the O <subscript>3</subscript> -pollution at the study location-ns as well as their accumulation in distant regions.<br />Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.<br /> (Copyright © 2024 Elsevier Ltd. All rights reserved.)
Details
- Language :
- English
- ISSN :
- 1873-6424
- Volume :
- 346
- Database :
- MEDLINE
- Journal :
- Environmental pollution (Barking, Essex : 1987)
- Publication Type :
- Academic Journal
- Accession number :
- 38417604
- Full Text :
- https://doi.org/10.1016/j.envpol.2024.123662