The synergetic control of NO2 and O3 concentrations in a manufacturing city of southern China

Chen, Xi; Shang-ji, Situ; Zhang, Qi; Wang, Xuemei; Sha, Chenyuan; Zhouc, Liuyi; Wu, Liqing; Wu, Leiming; Ye, Lyumeng; Li, Cheng

doi:10.1016/j.atmosenv.2018.12.021

Cited by 66 publications

(34 citation statements)

References 46 publications

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“…To validate the localized CH 2 O/NO 2 ratio method, some comparisons were performed between our satellite‐based ozone chemical regimes and the previous observation‐based or model‐based results (Figures and ). The comparison results revealed that the satellite‐based ozone chemical regimes are generally in agreement with the previous results reported in the PRD region, particularly in ozone pollution season of autumn (Chen et al., 2019; Cheng et al., 2010; He et al., 2019; Ling & Guo, 2014; Lu et al., 2010; Ou et al., 2016; Tan et al., 2019; Wang et al., 2017c, 2018, 2019a; Yu et al., 2020; Zhang et al., 2008), indicating that the localized CH 2 O/NO 2 ratio method provided a reliable identification in ozone chemical regimes. Figure 12 shows the spatiotemporal distributions of annual‐scale ozone chemical regimes over the PRD region.…”

Section: Resultssupporting

confidence: 89%

Tropospheric Ozone Variability Over Hong Kong Based on Recent 20 years (2000–2019) Ozonesonde Observation

et al. 2021

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The recent 20 years (2000–2019) ozonesonde profiles recorded at the Hong Kong Observatory are analyzed to study the Tropospheric Ozone (TropO3) variability over Hong Kong, South China. The TropO3 profiles are described without the constraints of traditional monthly averages; they are clustered based on a Self‐Organizing Map (SOM) to explore the short‐term variability, and separated into two 10‐year periods to investigate the long‐term variability based on pooled statistical analysis. The roles of precursor emissions, dynamic transport, and photochemical formation in multiple‐timescale TropO3 variability are further evaluated with the aid of meteorological and satellite data, surface observation, emission inventory, and backward trajectory analysis. The results suggest that TropO3 over Hong Kong has a seasonal and vertical distribution featuring a widely recognized spring maximum. The SOM‐based clustering analysis emphasizes a strong dependence of short‐term variability in TropO3 profile patterns on cross‐latitude transport conditions, including rich‐O3 transport from midlatitude region and poor‐O3 transport from tropics. However, high O3 levels throughout the troposphere (usually in early spring) are largely due to the combination of stratospheric intrusion and biomass burning. During the whole study period, the O3 concentrations have increased substantially in the lower troposphere. Springtime wildfire‐related emissions over the upwind Indochina Peninsula are responsible for the lower free‐tropospheric O3 increases. In contrast, the boundary‐layer O3 uptrends with a larger increasing rate near the surface are mostly attributed to the reduced NO titration effect due to the sharp reduction of NOx emissions.

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Section: Resultssupporting

confidence: 89%

Tropospheric Ozone Variability Over Hong Kong Based on Recent 20 years (2000–2019) Ozonesonde Observation

et al. 2021

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“…As expected, 8-h O 3 had the strongest positive correlation with T, which was due to the important role of temperature in O 3 formation [46]. In contrast, NO 2 values were negatively correlated with T, which was due to the transformation of NO 2 to O 3 and the vertical dispersion under high temperature conditions [47]. Only weak correlations were observed between T and other air pollutants.…”

Section: Correlation Between Air Pollutants and Meteorological Factorssupporting

confidence: 59%

Characteristics of Air Pollution and Their Relationship with Meteorological Parameters: Northern Versus Southern Cities of China

Zhou

et al. 2020

Atmosphere

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Air pollution shows a generally decreasing trend from the north to the south in China since 2013 (GB3095-2012, the current standard for monitoring). However, an opposite observation was recorded in 2017, especially in winter. In this study, we collected monitoring data of six air pollutants in 2016 and 2017, from a northern city (Beijing) and a southern city (Nanjing) for comparison. As air pollution was highly dependent upon meteorological conditions, we further analyzed their relationships to explain this abnormal phenomenon. Seasonal averaged PM2.5, PM10, SO2, CO, and NO2 were negatively correlated with wind scale (WS) while 8-h O3 exhibited an opposite relationship. Relative humidity (RH) has opposite effects on the concentrations of different pollutants in Beijing and Nanjing. The 8-h O3 showed the closest positive correlation with temperature (T), which is due to its formation mechanism. In Beijing, decreased RH, together with more wind from northwest in winter, resulted in an improved air quality in 2017. In Nanjing, WS, RH, T, and wind direction fluctuated within a narrow range in each season, leading to relatively stable pollutant concentrations. These results suggest that meteorological conditions are important factors to evaluate the air quality and implement control measures.

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“…This finding is very indicative of the management of the outpatient department of the hospital. AHRQ has developed a series of guides for hospitals on improving the management of outpatient visit flows and reducing emergency department crowding [ 6 ]. The hospital of dermatology, as the specialized hospital, should develop an alert, flexible, and fast-reacting system which can predict/estimate the weather and pollution change to maintain high efficiency for the treatment of the common and reemerging conditions [ 34 ].…”

Section: Discussionmentioning

confidence: 99%

“…NO 2 is a toxic reddish-brown gas, a strong oxidizing agent and common atmospheric pollutant that is produced by combustion, as of fossil fuels, car exhaust, smog, and cigarettes. Since the concentration of NO 2 is tightly related to industry development, manufacturing, and transportation, it is a common air pollutant in developing countries and regions that pursue industrialization [ 6 ]. The inhale of NO 2 damages the respiratory system, and the skin exposure also damages skin integrity and makes eczema happen [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

NO2 exposure increases eczema outpatient visits in Guangzhou, China: an indication for hospital management

Zhang

Jing

et al. 2021

BMC Public Health

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Background Ambient nitrogen dioxide (NO2) is a common air pollutant in developing countries and causes skin conditions, but its effect on eczema in subtropical areas is not clear in China. Object To measure the effect of short-term exposure of NO2 on the incidence of eczema and the change of outpatient visits. Methods Data of daily temperature, air pollutants, and outpatient visits from 2013 to 2018 were collected in a row. The generalized additive model (GAM) and Poisson distribution were used to assess the association between short-term exposure of NO2 and the outpatient visits of patients with eczema. The cumulative exposure effect of lag 0–3 days and the displacement effect of NO2 and other pollutants were considered as well. A single pollutant model was used to examine the independent association, and a two-pollutant model was adopted to control the confounding effect. Results The daily outpatient visits of eczema increased from 75.26 to 190.85 from 2013 to 2018 (P < 0.001). The combined influence of NO2 and the related pollutant exerted a stronger influence on the incidence of eczema. The maximum effect of NO2 appeared on the exposed day. (lag 0) and disappeared on day 4 (lag 3). The children and seniors were more vulnerable to NO2 exposure. Conclusion Exposure to NO2 is tightly associated with eczema incidence and outpatient visits. The hospitals should react to the visit fluctuations and adjust physician duty shifts to improve outpatient service efficiency.

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The synergetic control of NO2 and O3 concentrations in a manufacturing city of southern China

Cited by 66 publications

References 46 publications

Tropospheric Ozone Variability Over Hong Kong Based on Recent 20 years (2000–2019) Ozonesonde Observation

Tropospheric Ozone Variability Over Hong Kong Based on Recent 20 years (2000–2019) Ozonesonde Observation

Characteristics of Air Pollution and Their Relationship with Meteorological Parameters: Northern Versus Southern Cities of China

NO2 exposure increases eczema outpatient visits in Guangzhou, China: an indication for hospital management

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