An analysis of the effects of weather and air pollution on tropospheric ozone using a generalized additive model in Western China: Lanzhou, Gansu

Ma, Yanhui; Ma, Bingji; Jiao, Haoran; Zhang, Yifan; Xin, Jinyuan; Yu, Zhiang

doi:10.1016/j.atmosenv.2020.117342

Cited by 62 publications

(37 citation statements)

References 36 publications

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“…8 ), suggesting that the reductions in NO x and formaldehyde in February 2020 were not sufficiently high to decrease ozone concentrations. Studies ( Gao et al, 2020 ; Ma et al, 2020 ; Zhu et al, 2017 ) have reported increases in surface ozone concentrations in recent years, underscoring the challenge that China has faced while attempting to reduce surface ozone. Table 8 shows the surface ozone concentrations in East China, BTH, and Wuhan regions for 2019 and 2020 and the relationship between daily ozone and daily meteorological factors.…”

Section: Resultsmentioning

confidence: 99%

Impact of the COVID-19 outbreak on air pollution levels in East Asia

Ghahremanloo

Lops

Choi

et al. 2021

Science of The Total Environment

138

109

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This study leverages satellite remote sensing to investigate the impact of the coronavirus outbreak and the resulting lockdown of public venues on air pollution levels in East Asia. We analyze data from the Sentinel-5P and the Himawari-8 satellites to examine concentrations of NO 2 , HCHO, SO 2 , and CO, and the aerosol optical depth (AOD) over the BTH, Wuhan, Seoul, and Tokyo regions in February 2019 and February 2020. Results show that most of the concentrations of pollutants are lower than those of February 2019. Compared to other pollutants, NO 2 experienced the most significant reductions by almost 54%, 83%, 33%, and 19% decrease in BTH, Wuhan, Seoul, and Tokyo, respectively. The greatest reductions in pollutants occurred in Wuhan, with a decrease of almost 83%, 11%, 71%, and 4% in the column densities of NO 2 , HCHO, SO 2 , and CO, respectively, and a decrease of about 62% in the AOD. Although NO 2 , CO, and formaldehyde concentrations decreased in the Seoul and Tokyo metropolitan areas compared to the previous year, concentrations of SO 2 showed an increase in these two regions due to the effect of transport from polluted upwind regions. We also show that meteorological factors were not the main reason for the dramatic reductions of pollutants in the atmosphere. Moreover, an investigation of the HCHO/NO 2 ratio shows that in many regions of East China, particularly in Wuhan, ozone production in February 2020 is less NO X saturated during the daytime than it was in February 2019. With large reductions in the concentrations of NO 2 during lockdown situations, we find that significant increases in surface ozone in East China from February 2019 to February 2020 are likely the result of less reaction of NO and O 3 caused by significantly reduced NO X concentrations and less NO X saturation in East China during the daytime.

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Section: Resultsmentioning

confidence: 99%

Impact of the COVID-19 outbreak on air pollution levels in East Asia

Ghahremanloo

Lops

Choi

et al. 2021

Science of The Total Environment

138

109

View full text Add to dashboard Cite

show abstract

“…Clarifying the impact of human activities and meteorological factors on air quality during major events is crucial to the formulation of pollution control policies during major events and the long-term air pollution control policies of Beijing. Generalized Additive Models (GAM) can balance the fitting performance and have high interpretability, it is a useful tool to estimate the air quality responses to human activities and meteorology ( Zhou et al, 2012 ; Ma et al, 2020 ). Ma et al (2020) used GAM to estimate the effects of meteorology on tropospheric ozone in Lanzhou, China, and found that the method gave improved estimates with respect to the temporal variations.…”

Section: Introductionmentioning

confidence: 99%

“…Generalized Additive Models (GAM) can balance the fitting performance and have high interpretability, it is a useful tool to estimate the air quality responses to human activities and meteorology ( Zhou et al, 2012 ; Ma et al, 2020 ). Ma et al (2020) used GAM to estimate the effects of meteorology on tropospheric ozone in Lanzhou, China, and found that the method gave improved estimates with respect to the temporal variations. In contrast to parametric models, GAM does not need prior knowledge and can determine relationships in the measurements using data-driven analysis ( Zhou et al, 2012 ).…”

Section: Introductionmentioning

confidence: 99%

Quantitative estimation of meteorological impacts and the COVID-19 lockdown reductions on NO2 and PM2.5 over the Beijing area using Generalized Additive Models (GAM)

Hua

Zhang

Foy

et al. 2021

Journal of Environmental Management

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“…Apart from the sources, tropospheric ozone is also affected by the meteorological elements. A study found that the overwhelming factor of the surface ozone in western China is temperature using the Generalized Additive Models (GAM) [12], while the research carried out with the Community Multiscale Air Quality (CMAQ) modeling system showed that the main influencing factor of tropospheric ozone in most parts of China is the change of wind field. In addition, humidity, boundary layer height, cloud shape, and precipitation have obvious effects on tropospheric ozone [13].…”

Section: Introductionmentioning

confidence: 99%

Impact of Black Carbon on Surface Ozone in the Yangtze River Delta from 2015 to 2018

et al. 2021

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Despite the yearly decline in PM2.5 in China, surface ozone has been rapidly increasing recently, which makes it imperative to coordinate and control both PM2.5 and ozone in the atmosphere. This study utilized the data of pollutant concentrations and meteorological elements during 2015 to 2018 in Nanjing, China to analyze the daily correlation between black carbon and ozone (CBO), and the distribution of the pollutant concentrations under different levels of CBO. Besides, the diurnal variations of pollutant concentrations and meteorological elements under high positive and negative CBO were discussed and compared. The results show that the percentage of positive CBO had been increasing at the average rate of 7.1%/year, and it was 38.7% in summer on average, nearly twice of that in other seasons (19.2%). The average black carbon (BC), PM2.5 and NO2 under positive CBO was lower than those under negative CBO. It is noticeable that the surface ozone began to ascend when CBO was up to 0.2, with PM2.5 and NO2 decreasing and BC remaining steady. Under negative CBO, pollutant concentrations and meteorological elements showed obvious diurnal variations: BC showed a double-peak pattern and surface ozone, PM2.5, SO2 and CO showed single-peak patterns and NO2 showed a trough from 10:00 to 19:00. Wind speed and visibility showed a single-peak pattern with little seasonal difference. Relative humidity rose first, then it lowered and then it rose. Under positive CBO, the patterns of diurnal variations became less obvious, and some of them even showed no patterns, but just fluctuated at a certain level.

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An analysis of the effects of weather and air pollution on tropospheric ozone using a generalized additive model in Western China: Lanzhou, Gansu

Cited by 62 publications

References 36 publications

Impact of the COVID-19 outbreak on air pollution levels in East Asia

Impact of the COVID-19 outbreak on air pollution levels in East Asia

Quantitative estimation of meteorological impacts and the COVID-19 lockdown reductions on NO2 and PM2.5 over the Beijing area using Generalized Additive Models (GAM)

Impact of Black Carbon on Surface Ozone in the Yangtze River Delta from 2015 to 2018

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