Impacts of Meteorology and Emissions on O3 Pollution during 2013–2018 and Corresponding Control Strategy for a Typical Industrial City of China

Yao, Shiyin; Wei, Wei; Cheng, Shuiyuan; Niu, Yuan; Guan, Panbo

doi:10.3390/atmos12050619

Cited by 7 publications

(3 citation statements)

References 40 publications

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“…The four most polluted cities (Heze, Xinxiang, Zhangjiakou, and Zhengzhou), wherein the O 3 formation sensitivity regime changed from VOC limited (except Zhengzhou, which was in a transitional regime) during summer to transitional during this O 3 episode (Figure S10), were selected to determine a better VOC-to-NOx reduction ratio. Based on the VOC/NOx emission ratios reported in previous studies, − five different reduction scenarios with VOC-to-NOx ratios (VOC/NOx = 1:3, 1:2, 1:1, 2:1, 3:1) were set within 100% reductions during the O 3 episode and summer of 2021 to investigate the changes in the MDA8 O 3 concentration using the OBM (Figure ). To achieve 10% reduction in the MDA8 O 3 concentration (indicated by the black dashed line shown in Figure ) during the O 3 episode, an NOx reduction ratio of >50% is required if the reduction ratios of NOx to VOCs exceed 2:1.…”

Section: Resultsmentioning

confidence: 99%

Evolution of Ozone Formation Sensitivity during a Persistent Regional Ozone Episode in Northeastern China and Its Implication for a Control Strategy

Zhang,

Gao,

Zhu

et al. 2023

Environ. Sci. Technol.

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In recent years, the magnitude and frequency of regional ozone (O 3 ) episodes have increased in China. We combined ground-based measurements, observation-based model (OBM), and the Weather Research and Forecasting and Community Multiscale Air Quality (WRF−CMAQ) model to analyze a typical persistent O 3 episode that occurred across 88 cities in northeastern China during June 19−30, 2021. The meteorological conditions, particularly the wind convergence centers, played crucial roles in the evolution of O 3 pollution. Daily analysis of the O 3 formation sensitivity showed that O 3 formation was in the volatile organic compound (VOC)-limited or transitional regime at the onset of the pollution episode in 92% of the cities. Conversely, it tended to be or eventually became a NOxlimited regime as the episode progressed in the most polluted cities. Based on the emission-reduction scenario simulations, mitigation of the regional O 3 pollution was found to be most effective through a phased control strategy, namely, reduction of a high ratio of VOCs to NOx at the onset of the pollution and lower ratio during evolution of the O 3 episode. This study presents a new possibility for regional O 3 pollution abatement in China based on a reasonable combination of OBM and the WRF−CMAQ model.

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Section: Resultsmentioning

confidence: 99%

Evolution of Ozone Formation Sensitivity during a Persistent Regional Ozone Episode in Northeastern China and Its Implication for a Control Strategy

Zhang,

Gao,

Zhu

et al. 2023

Environ. Sci. Technol.

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“…Referring to the emission ratios of VOCs to NO x in other studies (Chen et al, 2019;Wang et al, 2019;Yao et al, 2021), 11 different emission reduction ratios of VOCs to NO x emissions (VOCs/NO x = 1:4, 1:3, 1:2, 1:1.5, 1:1.25, 1:1, 1.25:1, 1.5:1, 2:1, 3:1, 4:1) within 100% emission reductions under Chengdu, CMA, and Sichuan Province scenarios are conducted to investigate the changes for MDA8 O 3 in Chengdu (Figure 8). When the emission reduction ratio of VOCs/NO x is greater than 1, the decreasing trend of the averaged MDA8 O 3 concentration is closer to linear and the decrement in the averaged MDA8 O 3 concentration is significantly smaller than those when the ratio is less than 1.…”

Section: Differences In O 3 Reduction Effectivenessmentioning

confidence: 99%

Responses of ozone concentrations to the synergistic control of NOx and VOCs emissions in the Chengdu metropolitan area

Xiao

Tang

Zhang

et al. 2022

Front. Environ. Sci.

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Simulations of 108 emission reduction scenarios for NOx and VOCs using Comprehensive Air Quality Model with Extensions (CAMx) were conducted for eight cities in the Chengdu metropolitan area (CMA). The isopleth diagrams were drawn to explore the responses and differences of ozone (O3) concentrations to NOx and VOCs emission changes under Chengdu, CMA and Sichuan Province emission reduction scenarios. The results show that the O3-sensitive regimes of eight cities may change under different emission reduction scenarios. Under Chengdu emission reduction scenario, the Chengdu city is in the transition regime and O3 formation will shift from transition to VOC-limited when the VOCs emissions decreased by 50%, and the decreases in O3 concentrations caused by VOCs emission reductions are small. For the CMA and Sichuan Province emission reduction scenarios, all cities are NOx-limited in the baseline cases and with at least a 66% and a 77% reduction in NOx emissions, respectively, the daily maximum 8-h average O3 (MDA8) can attain the O3 standard (160 μg m−3). Although reductions in VOCs emissions can also lessen the O3 concentration, the effectiveness is relatively small. The changes in O3 concentrations under different VOCs to NOx emission reduction ratios indicate that all cities achieve a relatively high O3 concentration decrement with low VOCs to NOx emission reduction ratios and that the decreasing O3 concentrations caused by non-local emission reductions are much higher than those achieved by local emission reductions. In addition, the decreases in O3 concentrations in Chengdu are quite close when the total NOx and VOCs emissions reduction percentages are less than 30% under the CMA and Sichuan emission reduction scenarios.

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“…The study conducted over the Yangtze River Delta (YRD) city cluster of China to observe the effect of source and meteorology on ozone formation reported 5.1 ppbv contribution for ozone formation regulated via precursor mediated while 0.5 ppbv contribution via meteorological factor (Zhang et al 2021a ). The other study carried out in Handan and the industrial city in China suggests that ozone formation in the ambient atmosphere is a combined effect of reduction in source and meteorology (Yao et al 2021 ). Korhale et al ( 2021 ) have studied the ozone formation over Mumbai and Pune is mainly regulated via VOCs/NOx ratio and during the entire lockdown period, ozone formation governs by VOCs limited.…”

Section: Factors Affecting Air Pollution (Indoor and Outdoor)mentioning

confidence: 99%

Insights on Air Pollution During COVID-19: A Review

Kumar

2023

Aerosol Sci Eng

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Air quality improved due to a sudden reduction in the mass concentration of criteria pollutants (PM 2.5 , PM 10 , NO x , CO, SO 2 ) except ozone (O 3 ) over cities of the world during the novel coronavirus diseases (COVID-19) lockdown. Such reduction in pollutants concentration during the lockdown period is an indicator of pollutants contributed from human-induced sources. The elevated ozone level during the lockdown period is explained by shifted NOx-mediated reaction towards volatile organic carbon (VOCs) mediated reaction. The reduction in pollutants concentration and improved air quality is not uniform for outdoor and indoor environments. The indoor air quality is quite poor compared to outdoor throughout the lockdown period. The degradation in indoor air quality is associated with increased human activities and the degree of ventilation inside the home. The number of active COVID-19 cases is associated with air quality over a region. The improved air quality helped in a reduction in COVID-19 virus transmission among the people. Present review articles provide detailed insight into current research progress, the impact of lockdowns on outdoor and indoor air quality in different cities of the world. Further, this review articles provide a detailed overview of an elevated O 3 level during the lockdown period and the mechanism of formation.

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Impacts of Meteorology and Emissions on O3 Pollution during 2013–2018 and Corresponding Control Strategy for a Typical Industrial City of China

Cited by 7 publications

References 40 publications

Evolution of Ozone Formation Sensitivity during a Persistent Regional Ozone Episode in Northeastern China and Its Implication for a Control Strategy

Evolution of Ozone Formation Sensitivity during a Persistent Regional Ozone Episode in Northeastern China and Its Implication for a Control Strategy

Responses of ozone concentrations to the synergistic control of NOx and VOCs emissions in the Chengdu metropolitan area

Insights on Air Pollution During COVID-19: A Review

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