Reply on RC1 DOI Creative Commons
Shaodong Xie

Published: Dec. 28, 2024

Abstract. To reduce the uncertainties in identifying key volatile organic compounds (VOCs) species influencing ozone (O3) formation based on observed VOCs concentrations, this study proposed identification from initial concentrations. The concentrations during daytime and nighttime were calculated using reaction rates hourly measured 99 at Deyang, Chengdu, Meishan, southwest China summer. of alkenes aromatics higher than ones. largest differences between 1.04 ppbv for cis-2-butene 0.86 isoprene 1.98 respectively. Due to secondary production, oxygenated lower -0.54 acetone -0.58 acetaldehyde -0.5 Based top three contributing O3 potential cis-2-butene, isoprene, m,p-xylene Deyang; m,p-xylene, Chengdu; ethylene, These results differed those Comprehensively calculating helps accurately identify VOC formation.

Language: Английский

Influence of Transboundary Pollution on the Variability of Surface Ozone Concentrations in the Desert Southwest of the U.S.: Case Study for Arizona DOI Creative Commons
Grace Betito, Avelino F. Arellano, Armin Sorooshian

et al.

Atmosphere, Journal Year: 2024, Volume and Issue: 15(4), P. 401 - 401

Published: March 25, 2024

Arizona, a rapidly growing state in the southwestern U.S., faces ozone pollution challenges, including nonattainment areas Yuma and Maricopa counties influenced by neighboring transport. In this study, we use five-year (2017–2021) hourly back-trajectories O3 concentration data for concentration-weighted trajectory (CWT) analysis to identify transport pathways potential source regions of at six monitoring sites Arizona. We divide into five seasons (winter, spring, dry summer, monsoon fall) examine variations across seasons. The highest mean concentrations occur during spring (37–49 ppb), summer (39–51 (34–49 while winter (19–41 ppb) exhibits lowest seasonal mean. CWT results reveal that high (≥40 with exception Phoenix Tucson sites, are significantly regional international transport, especially (14.9–35.4%) (12.7–26.9%). major (excluding sites) predominantly located outside This study highlights critical role influencing variability within Arizona will be valuable shaping control strategies future.

Language: Английский

Citations

6
Investigation of atmospheric VOCs sources and ozone formation sensitivity during epidemic closure and control: A case study of Zhengzhou DOI
Jiahua Guo, Qixiang Xu,

Shijie Yu

et al.

Atmospheric Pollution Research, Journal Year: 2024, Volume and Issue: 15(4), P. 102035 - 102035

Published: Jan. 1, 2024

Language: Английский

Citations

4
Process-specified emission factors and characteristics of VOCs from the auto-repair painting industry DOI
Hailin Xiao,

Jia-Ni Zhang,

Yuxin Hou

et al.

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 467, P. 133666 - 133666

Published: Feb. 5, 2024

Language: Английский

Citations

4
Spatiotemporal correlations of PM2.5 and O3 variations: A street-scale perspective on synergistic regulation DOI

Xinyuan Lin,

Yangbin Dong,

Z.K. Teng

et al.

The Science of The Total Environment, Journal Year: 2025, Volume and Issue: 965, P. 178578 - 178578

Published: Jan. 31, 2025

Language: Английский

Citations

0
Bioaerosols and VOC emissions from landfill leachate treatment processes: Regional differences and health risks DOI
Pengyu Li,

Chen Wang,

Lin Li

et al.

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 480, P. 136232 - 136232

Published: Oct. 21, 2024

Language: Английский

Citations

3
The Characteristics, Sources, and Health Risks of Volatile Organic Compounds in an Industrial Area of Nanjing DOI Creative Commons
Tao Tan, Xinyuan Xu,

Haixin Gu

et al.

Toxics, Journal Year: 2024, Volume and Issue: 12(12), P. 868 - 868

Published: Nov. 29, 2024

This study investigates the chemical complexity and toxicity of volatile organic compounds (VOCs) emitted from national petrochemical industrial parks their effects on air quality in an area Nanjing, China. Field measurements were conducted 1 December 2022, to 17 April 2023, focusing VOC concentrations speciations, diurnal variations, ozone formation potential (OFP), source identification, associated health risks. The results revealed average total (TVOC) concentration 15.9 ± 12.9 ppb OFP 90.1 109.5 μg m−3. Alkanes constituted largest fraction VOCs, accounting for 44.1%, while alkenes emerged as primary contributors OFP, comprising 52.8%. TVOC peaked before dawn, a pattern attributed early morning activities nighttime heavy vehicle operations. During periods classified clean, when levels below 160 m−3, both (15.9 ppb) (90.4 110.0 m−3) higher than those during polluted hours. analysis identified key sources emissions, including automobile exhaust, oil gas evaporation, discharges, with additional pollution adjacent regions. Health risk assessments indicated that acrolein exceeded non-carcinogenic threshold at specific times. Moreover, trichloromethane, 1,3-butadiene, 1,2-dichloroethane, benzene found surpass acceptable lifetime carcinogenic level (1 × 10−6) certain periods. These findings highlight urgent need enhanced monitoring regulatory measures aimed mitigating emissions protecting public areas. In context complex urban areas, policymakers should focus controlling which can not only reduce secondary pollution, but also inhibit harm toxic substances human health.

Language: Английский

Citations

3
Differences in the key volatile organic compound species between their emitted and ambient concentrations in ozone formation DOI Creative Commons
Xudong Zheng, Shaodong Xie

Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(6), P. 3807 - 3820

Published: April 1, 2025

Abstract. The emissions and secondary transformations of volatile organic compounds (VOCs) play a significant role in ozone (O3) formation. Previous studies have often relied on ambient VOC concentrations to identify key species. However, represent the residual after emitted VOCs been consumed, which can introduce substantial uncertainties. To address this issue, study proposes novel method species both anthropogenic biogenic emissions. are calculated during nighttime daytime summer using nitrate radical, O3, hydroxyl radical reaction rates 99 measured at Deyang, Chengdu, Meishan, China. alkenes aromatics higher than concentrations. largest differences between 1.04 ppbv for cis-2-butene 0.81 isoprene 1.79 Meishan. In contrast, due production, oxygenated lower −0.54 acetone −0.58 acetaldehyde −0.5 Based concentrations, is one top three contributing O3 formation all sites, may be overlooked observed Comprehensive calculation enables accurately identified.

Language: Английский

Citations

0
Investigation of the Spatiotemporal Variation Characteristics and Potential Source Regions of PM2.5, PM10, and O3 in Shiyan, China DOI
Ying Zhang, Shici Zhang, Rui Zhang

et al.

Aerosol Science and Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: April 12, 2025

Language: Английский

Citations

0
Aerosol Radiation Effect Outweighs VOCs Reactivity Effect on Vertical Ozone Photochemical Features DOI

Zhuyi Jiang,

Bin Zhu, Shuangshuang Shi

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2025, Volume and Issue: 130(9)

Published: May 8, 2025

Abstract The proportion of more active volatile organic compounds (VOCs) species decreases with altitude, whereas radiation increases vertically due to aerosol scattering near the surface, exerting opposite effects on vertical O 3 generation. Using observation‐based model (OBM) constrained by profiles, we identified that effect (ARE) has a stronger impact photochemical characteristics and ‐NOx‐VOC sensitivity than VOCs reactivity (VRE). ARE is dominant factor, promoting formation ·OH (increases 36.7% 106.3%), enhancing high‐altitude oxidation, shifting parts VOC‐limited regimes NOx‐limited (VOCs/NOx ratio 21.1%). Additionally, rapid NOx depletion altitude leads limitation aloft, amplifying ARE's (ratio 28.1%). These findings improve understanding ozone generation conditions suggest attention should be paid environments in surface management.

Language: Английский

Citations

0
Causes of Summer Ozone Pollution Events in Jinan, East China: Local Photochemical Formation or Regional Transport? DOI Creative Commons
Baolin Wang,

Sun Yuchun,

Lei Sun

et al.

Atmosphere, Journal Year: 2024, Volume and Issue: 15(2), P. 232 - 232

Published: Feb. 15, 2024

Simultaneous measurements of atmospheric volatile organic compounds (VOCs), conventional gases and meteorological parameters were performed at an urban site in Jinan, East China, June 2021 to explore the formation evolution mechanisms summertime ozone (O3) pollution events. O3 Episode Ⅰ, II, non-O3 episodes identified based on China Ambient Air Quality Standards differences precursor concentrations. The concentrations I II 145.4 μg/m3 166.4 μg/m3, respectively, which significantly higher than that episode (90 μg/m3). For precursors, VOCs NOx increased by 48% 34% I, decreased 21% 27% compared days. analysis m,p-xylene ethylbenzene ratio (X/E) OH exposure demonstrated aging air masses was other two episodes, could not be explained localized photochemical consumption. Therefore, we speculate high driven regional transport its precursors. Backward trajectory simulations indicated during concentrated from south. In contrast, combination favorable conditions (high temperatures low humidity) led excess I. Positive matrix factorization (PMF) model results emissions combustion gasoline vehicle exhausts contributed elevated solvent usage may important contributor formation. this study emphasize importance strengthening joint control precursors with neighboring cities, especially south, is crucial for Jinan mitigate pollution.

Language: Английский

Citations

3