Increase in daytime ozone exposure due to nighttime accumulation in a typical city in eastern China during 2014–2020

Wang, Junhua; Wang, Dawei; Ge, Baozhu; Lin, Weili; Ji, Dongsheng; Xiaole, Pan; Li, Jie; Wang, Zifa

doi:10.1016/j.apr.2022.101387

Cited by 16 publications

(9 citation statements)

References 74 publications

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“…Importantly, a recent study also showed that greater plant biomass loss could be caused by equivalent O 3 fluxes during the nighttime due to the depletion of cell wall-localized ascorbate (Goumenaki et al 2021 ). These findings indicate that nighttime O 3 impacts should be considered in modeling (Wang et al 2022 ). In such areas, O 3 risks to vegetation might be considerably underestimated with current exposure metrics, and nighttime O 3 impacts should be considered in regional modeling.…”

Section: Resultsmentioning

confidence: 93%

“…The oxidation of terpenes and other VOCs is dominated by reactions with nitrate radicals, affecting the formation of O 3 (Folkins and Chatfield 2000 ). NO x modulates the nighttime chemistry of O 3 via O 3 –NO–NO 2 interactions (Sicard et al 2016a ; Wang et al 2022 ). Higher concentrations are recorded at night due to lower gas-phase titration of O 3 with NO.…”

Section: Resultsmentioning

confidence: 99%

“…Although VOCs have not been included in the present study, they play a crucial role in regulating O 3 in the atmosphere, and the ratio NO x to VOC is more important than NO x concentrations to regulate O 3 (Akimoto and Tanimoto 2022 ; Wang et al 2022 ; Zhang et al 2022 ). An important point that needs attention is the VOC emissions from vegetation, since a considerable part of the VOC is contributed from vegetation, with plant species showing a wide variability in the size and composition of emissions, even among species of the same family (Richards et al 2013 ; Sicard et al 2018 ; Fu 2022 ; Masui et al 2022 ).…”

Section: Resultsmentioning

confidence: 99%

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Spatiotemporal variations of ozone exposure and its risks to vegetation and human health in Cyprus: an analysis across a gradient of altitudes

Agathokleous

Saitanis

Savvides³

et al. 2022

J. For. Res.

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Ground-level ozone (O3) affects vegetation and threatens environmental health when levels exceed critical values, above which adverse effects are expected. Cyprus is expected to be a hotspot for O3 concentrations due to its unique position in the eastern Mediterranean, receiving air masses from Europe, African, and Asian continents, and experiencing a warm Mediterranean climate. In Cyprus, the spatiotemporal features of O3 are poorly understood and the potential risks for forest health have not been explored. We evaluated O3 and nitrogen oxides (NO and NO2) at four regional background stations at different altitudes over 2014−2016. O3 risks to vegetation and human health were estimated by calculating accumulated O3 exposure over a threshold of 40 nmol mol−1 (AOT40) and cumulative exposure to mixing ratios above 35 nmol mol−1 (SOMO35) indices. The data reveal that mean O3 concentrations follow a seasonal pattern, with higher levels in spring (51.8 nmol mol−1) and summer (53.2 nmol mol−1) and lower levels in autumn (46.9 nmol mol−1) and winter (43.3 nmol mol−1). The highest mean O3 exposure (59.5 nmol mol−1) in summer occurred at the high elevation station Mt. Troodos (1819 m a.s.l.). Increasing (decreasing) altitudinal gradients were found for O3 (NOx), driven by summer–winter differences. The diurnal patterns of O3 showed little variation. Only at the lowest altitude O3 displayed a typical O3 diurnal pattern, with hourly differences smaller than 15 nmol mol−1. Accumulated O3 exposures at all stations and in all years exceeded the European Union’s limits for the protection of vegetation, with average values of 3-month (limit: 3000 nmol mol−1 h) and 6-month (limit: 5000 nmol mol−1 h) AOT40 for crops and forests of 16,564 and 31,836 nmol mol−1 h, respectively. O3 exposures were considerably high for human health, with an average SOMO35 value of 7270 nmol mol−1 days across stations and years. The results indicate that O3 is a major environmental and public health issue in Cyprus, and policies must be adopted to mitigate O3 precursor emissions at local and regional scales.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Spatiotemporal variations of ozone exposure and its risks to vegetation and human health in Cyprus: an analysis across a gradient of altitudes

Agathokleous

Saitanis

Savvides³

et al. 2022

J. For. Res.

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“…9b, the percentage of days with O 3 _8h air quality at sites S1, S3, S5, and S6 classi ed as and showed a trend of increasing and then decreasing, but the number of excellent and good days accounted for more than 90% of the total number of days in a year. The percentage of Class III days at sites S2, S4, and S6 were slightly larger than the other three sites, and the pollution was more severe, which makes the eyes and respiratory system of sensitive people living at these three sites irritated and feel discomfort (Wang et al 2022).…”

Section: Air Pollution Levels Of ρ(Pm 25 ) and ρ(O 3 _8h) Potential E...mentioning

confidence: 91%

“…According to the 2015 Global Burden of Disease Study, O 3 ranked 33rd among the risk factors for premature death and was a major contributor to 254,000 deaths worldwide (Hakim et al 2019). Long-term exposure to high concentrations of O 3 could damage the human respiratory system and also leads to a range of eye diseases (Wang et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Assessment of air quality before and during the COVID-19 and its potential health impacts in an arid oasis city: Urumqi, China

Sun

Aishan

Halik

et al. 2022

Preprint

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Air pollution has become one of the major environmental concerns to academia and urban residents. As a key megacity city of the "Silk Road Economic Belt", Urumqi has been listed as one of the ten most polluted cities in the world, posing a serious threat to the urban environment and residents' health. Therefore, the assessment of air pollution and its health impact on urban residents is urgently required for promoting the sustainable development of the city. This study analyzed the temporal and spatial changes in the concentration of major air pollutants in Urumqi and its response to epidemic prevention and control measures based on the data of PM2.5, PM10, SO2, NO2, CO, and O3_8h from 10 air quality monitoring stations in Urumqi from January 1, 2017, to December 31, 2021, mainly focusing on the temporal and spatial variation characteristics of PM2.5 and O3_8h concentrations, changes in pollution levels and their potential risks on human health. The results showed that the concentrations of air pollutants PM2.5, PM10, SO2, NO2, CO, and O3_8h at various air quality monitoring sites from 2017 to 2021 showed a cyclical trend, and the implementation of the government's strict COVID-19 prevention and control measures had a significant effect on the reduction of air pollutant concentrations. The mean value of ρ(PM2.5) decreased from 2017 to 2021, while ρ(O3_8h) showed a waveform change trend (increased in 2017–2018, decreased in 2018–2020, and increased after 2020 ). In terms of the distribution area, the variation of ρ(PM2.5) and ρ(O3_8h) were greater in industrial areas than in commercial and residential areas. Continuous wavelet coherence exists between AQI and PM2.5 and O3_8h at each site during the period from January 2018 to December 2020, and AQI and PM2.5 were positively correlated. The high pollution levels (grades IV and V) of air pollutants PM2.5 and O3_8h in Urumqi decreased year by year, indicating that the number of days with potential threats to residents' health is gradually decreasing. Therefore, more attention should be paid to the control and governance of air pollution in Urumqi.

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Assessment of air quality before and during the COVID-19 and its potential health impacts in an arid oasis city: Urumqi, China

Sun

Aishan

Halik

et al. 2022

Stoch Environ Res Risk Assess

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As a key node city of the “Silk Road Economic Belt” Urumqi has been listed as one of the ten most polluted cities in the world, posing a serious threat to the urban environment and residents' health. This study analyzed the air quality before and during the COVID-19 (Coronavirus disease 2019) pandemic and its potential health effects based on the data of PM 2.5 , PM 10 , SO 2 , NO 2 , CO, and O 3 _8h levels from 10 air quality monitoring stations in Urumqi from January 1, 2017, to December 31, 2021. As per the results, the concentrations of the air pollutants PM 2.5 , PM 10 , SO 2 , NO 2 , CO, and O 3 _8h in Urumqi from 2017 to 2021 showed a cyclical trend, and the implementation of COVID-19 prevention and control measures could effectively reduce the concentration(ρ) of air pollutants. The mean value of ρ(PM 2.5 ) decreased from 2017 to 2021, whereas ρ(O 3 _8h) showed a waveform change trend (increased in 2017–2018, decreased in 2018–2020, and increased after 2020). Meanwhile, the maximum annual average values of ρ(PM 2.5 ) and ρ(O 3 _8h) for the six monitoring stations during 2017–2021 occurred at sites S2 (74.37 µg m −3 ) and S6 (91.80 µg m −3 ), respectively; rapid industrialization had a greater impact on PM 2.5 and O 3 _8h concentrations compared to commercial and residential areas. In addition, the air quality index data series can characterize the fluctuation trend of PM 2.5 . The high pollution levels (Class IV and V) of the air pollutants PM 2.5 and O 3 _8h in Urumqi have been decreasing annually, and good days can account for 80–95% of the total number of days in the year, indicating that the number of days with a potential threat to residents' health is gradually decreasing. Therefore, more attention should be paid in controlling and managing air pollution in Urumqi.

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Increase in daytime ozone exposure due to nighttime accumulation in a typical city in eastern China during 2014–2020

Cited by 16 publications

References 74 publications

Spatiotemporal variations of ozone exposure and its risks to vegetation and human health in Cyprus: an analysis across a gradient of altitudes

Spatiotemporal variations of ozone exposure and its risks to vegetation and human health in Cyprus: an analysis across a gradient of altitudes

Assessment of air quality before and during the COVID-19 and its potential health impacts in an arid oasis city: Urumqi, China

Assessment of air quality before and during the COVID-19 and its potential health impacts in an arid oasis city: Urumqi, China

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