Spatiotemporal characterization and regional contributions of O3 and NO2: An investigation of two years of monitoring data in Henan, China

Shang, Yu; Yin, Shasha; Zhang, Ruiqin; Wang, Lingling; Su, Fangcheng; Zhang, Yixiang; Yang, Jing

doi:10.1016/j.jes.2019.10.012

Cited by 42 publications

(13 citation statements)

References 44 publications

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“…13 linear relationship with its precursors (Tie et al, 2013). Studies on the O3 formation mechanism demonstrated that the sensitivity of O3 to precursors differs between different regions or under different pollution conditions (Fang et al, 2020;Jeon et al, 2014;Qiu, 2017;Yu et al, 2020). In this study, a negative exponential correlation was observed between the daily average concentrations of NO2 and O3 in 2013-2019 ( Fig.…”

Section: Accepted Manuscriptsupporting

confidence: 55%

Trends in Air Pollutant Concentrations and the Impact of Meteorology in Shandong Province, Coastal China, during 2013-2019

Zhao

Gang

et al. 2021

Aerosol Air Qual. Res.

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Emissions of air pollutants have been reduced in Shandong Province of China during 2013-2019. Meteorological conditions are an important factor affecting air pollutant concentrations, but few quantitative studies have been conducted on the effects of long-term and seasonal changes in meteorological on air quality. In this study, the trends in six criteria pollutants (including SO2, CO, PM10, PM2.5, NO2, and O3) from 2013 to 2019 in Shandong Province were analysed (PM2.5 and PM10: particulate matter with aerodynamic diameters less than 2.5 μm and 10 μm, respectively; O3: ozone). A Weather Research and Forecasting model coupled with Chemistry (WRF/Chem) was applied to evaluate the contributions of inter-annual and seasonal meteorological changes to the concentration reductions of six criteria pollutants. The results indicated that the concentrations of five criteria pollutants (exclude O3) decreased sharply before 2017, and then decreased slowly, while O3 concentration increased from 2013 to 2019. The

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Section: Accepted Manuscriptsupporting

confidence: 55%

Trends in Air Pollutant Concentrations and the Impact of Meteorology in Shandong Province, Coastal China, during 2013-2019

Zhao

Gang

et al. 2021

Aerosol Air Qual. Res.

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“…However, the number of days with O 3 as the primary pollutant increased by 80% from 15 days in 2019 to 27 days in 2020. In particular, most days with O 3 as the primary pollutant in 2020 occurred in April, which is likely due to the decrease in atmospheric NO X or NO 2 concentrations during this period ( Yu et al, 2020 ).…”

Section: Resultsmentioning

confidence: 99%

Air quality characteristics in Wuhan (China) during the 2020 COVID-19 pandemic

Chen

Wang

et al. 2021

Environmental Research

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Understanding the relationship between air quality, pollution emission control measures, and meteorological conditions is important for developing effective air quality improvement policies. In this study, we used pollution monitoring and meteorological data from January to May 2020 to analyze the air quality characteristics during the COVID-19 lockdown in Wuhan, which lasted from January 23 to April 8, 2020. Compared with the same period in 2019, the air quality in 2020 was significantly better. The total excellent and good air quality rates increased by 17.58%–90.08% in 2020; concentrations of NO 2 , particulate matter with a diameter <10 μm (PM 10 ) and <2.5 μm (PM 2.5 ), and total volatile organic compounds (TVOCs) also decreased by 38.23%, 30.25%, 32.92%, and 39.80%, respectively. Moreover, the number of days with NO 2 , PM 10 , and PM 2.5 as the primary pollutants decreased by approximately 10%, 9%, and 15%, respectively. We compared the wind direction, wind speed, temperature, and relative humidity in January–April 2020, 2019, 2018, and 2017 and found no obvious correlation between meteorological factors and improved air quality during the 2020 lockdown. The implementation of strict lockdown measures, such as home quarantining, traffic restrictions, and non-essential enterprise shutdowns, was the dominant cause for the substantial air quality improvement during the 2020 COVID-19 lockdown in Wuhan.

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“…The diurnal variation in Yulin from 2017-2019, similar to many cities in northern China, shows a typical single peak curve: a valley in early morning and a peak in afternoon ( Fig. 2B ; Wang et al, 2012 ; Yu et al, 2020b ; Li et al, 2020a ). It was apparent that the O 3 concentrations were highest in summer, then spring, autumn, and winter.…”

Section: Resultsmentioning

confidence: 75%

Ambient ozone pollution at a coal chemical industry city in the border of Loess Plateau and Mu Us Desert: characteristics, sensitivity analysis and control strategies

Yin

Zhang

et al. 2021

PeerJ

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In this study, ambient ozone (O3) pollution characteristics and sensitivity analysis were carried out in Yulin, a city in the central area of the Loess Plateau during 2017 to 2019 summer. O3 concentrations increased for 2017 to 2019. Correlation and statistics analysis indicated high temperature (T > 25 °C, low relative humidity (RH < 60%), and low wind speed (WS < 3 m/s) were favorable for O3 formation and accumulation, and the O3 pollution days (MDA8 O3 > 160 µg/m3) were predominantly observed when the wind was traveling from the easterly and southerly. O3 concentration in urban area of Yulin was higher than that in background. The pollution air masses from Fenwei Plain increase the level and duration of O3 pollution. In order to clarify the formation mechanism and source of O3, online measurements of volatile organic compounds (VOCs) were conducted from 7 July to 10 August in 2019. The average of VOCs concentration was 26 ± 12 ppbv, and large amounts of alkenes followed by aromatics, characteristic pollutants of the coal chemical industry, were detected in the ambient air. To further measure the sensitivity, the observation-based model (OBM) simulation was conducted. Empirical Kinetic Modeling Approach (EKMA) plot and relative incremental reactivity (RIR) value indicated Yulin located on VOCs-limited regime. That implied a slight decrease of NOx may increase O3 concentration. When the emission reduction ratio of anthropogenic VOCs/NOx higher than 1:1, the O3 will decrease. O3 control strategies analysis shows that the O3 targets of 5% and 10% O3 concentration reductions are achievable through precursor control, but more effort is needed to reach the 30% and 40% reduction control targets.

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Spatiotemporal characterization and regional contributions of O3 and NO2: An investigation of two years of monitoring data in Henan, China

Cited by 42 publications

References 44 publications

Trends in Air Pollutant Concentrations and the Impact of Meteorology in Shandong Province, Coastal China, during 2013-2019

Trends in Air Pollutant Concentrations and the Impact of Meteorology in Shandong Province, Coastal China, during 2013-2019

Air quality characteristics in Wuhan (China) during the 2020 COVID-19 pandemic

Ambient ozone pollution at a coal chemical industry city in the border of Loess Plateau and Mu Us Desert: characteristics, sensitivity analysis and control strategies

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