[Characteristicsï¼Sourcesï¼and Ozone-sensitive Species of VOCs in Four Seasons in Yuncheng].
Huan Jing Ke Xue
; 45(2): 678-688, 2024 Feb 08.
Article
en Zh
| MEDLINE
| ID: mdl-38471908
ABSTRACT
Based on the one-year observational data of volatile organic compounds ï¼VOCsï¼ in an urban area of Yuncheng in 2021ï¼ the concentrationï¼ compositionï¼ sourcesï¼ and ozone-sensitive species of VOCs in four seasons were analyzed. The results showed that the average annual concentration of VOCs was ï¼32.1 ±24.2ï¼×10-9ï¼ i.e.ï¼ at the national middle level. The seasonal concentrations of VOCs were in the order ofï¼ winter ï¼46.3×10-9ï¼> autumn ï¼35.5×10-9ï¼> spring ï¼25.6×10-9ï¼> summer ï¼21.2×10-9ï¼. Alkanes and OVOCs were the most dominant VOCs compoundsï¼ accounting for 69.0%-80.4% of TVOCs in Yuncheng. Affected by changes in source emissionsï¼ the proportion of OVOCs was higher in spring and summer ï¼41%-43%ï¼ï¼ whereas the proportion of alkanes was higher in autumn and winter ï¼42%-43%ï¼. Vehicle exhaustï¼ LPG/NGï¼ industrial productionï¼ and combustion sources were identified as the main sources of VOCs in Yuncheng. The largest contributors in the four seasons were vehicle exhaust ï¼28.5% in springï¼ï¼ secondary + combustion sources ï¼29.0% in summerï¼ï¼ LPG/NG sources ï¼30.4% in autumnï¼ï¼ and coal combustion ï¼27.3% in winterï¼. The ozone formation was located in the transitional regime in summer and in the VOC-limited regime in other seasons. Ozone production was more sensitive to alkenes ï¼isopreneï¼ ethyleneï¼ and propeneï¼ï¼ OVOCs ï¼acetaldehyde and propanalï¼ï¼ and aromatics ï¼xyleneï¼ tolueneï¼ and benzeneï¼. Winter was more sensitive to ethyleneï¼ and the other seasons were more sensitive to isoprene. The primary emission sources related to these sensitive species should be reduced to achieve the goal of air quality improvement.
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MEDLINE
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Zh
Año:
2024
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Article