Analysis of the Relationship between O3, NO and NO2 in Tianjin, China

Si, Han; Hai, Bian; Feng, Yinchang; Liu, Aixia; Li, Xiangjin; Zeng, Fanxin; Zhang, Xiaoling

doi:10.4209/aaqr.2010.07.0055

Cited by 272 publications

(226 citation statements)

References 24 publications

Supporting

Mentioning

196

Contrasting

Unclassified

Order By: Relevance

“…Result in the table suggested that, the daily variations of j NO 2 /k 3 value are similar to O 3 daily variations. Han et al (2011) also reported similar findings when calculating the j NO 2 /k 3 at Tianjian, China. Theoretically, the j NO 2 /k 3 value is supposed to be zero during the night time in absence of the photochemical reactions, however the background O 3 concentration in the atmosphere cause the j NO 2 /k 3 is at minimal around 5-7 ppb.…”

Section: Critical Conversion Point Based On Composite Diurnal Plotssupporting

confidence: 66%

The Influence of Spatial Variability of Critical Conversion Point (CCP) in Production of Ground Level Ozone in the Context of Tropical Climate

Awang

Elbayoumi

Ramli

et al. 2016

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

Critical conversion point (CCP) is a very crucial step in production of the ground level O 3 chemistry. Thus, a multivariate analysis was applied on the dataset of nine selected locations in Malaysia from 1999 to 2010. It incorporated hierarchical agglomerative cluster analysis (HACA) to explore the spatial variability of CCP and principal component analysis (PCA) to determine the major sources of the air pollutants that influence ozone CCP. High variability in CCP was observed between the monitoring stations that occurred during critical conversion time (CCT) from 8:00 a.m. to 11:00 a.m. The HACA results grouped the nine monitoring stations into three different clusters, based on the characteristics of ozone concentrations during CCT period. Results of PCA for the three clusters showed that the contributions to O 3 level variation during CCT by meteorological variables (UVB, temperature, relative humidity, and wind speed) are higher at 51.6%, 48.5%, and 33.3% than that of primary air pollutants (NO 2 , SO 2 , PM 10 ) at 19.2%, 21.4%, and 15.2% for cluster 1, cluster 2, and cluster 3, respectively. Therefore, applying a targeted spatial control strategy for ground level O 3 precursors during the CCT period is a crucial step.

show abstract

Section: Critical Conversion Point Based On Composite Diurnal Plotssupporting

confidence: 66%

The Influence of Spatial Variability of Critical Conversion Point (CCP) in Production of Ground Level Ozone in the Context of Tropical Climate

Awang

Elbayoumi

Ramli

et al. 2016

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

show abstract

“…Many studies on the O 3 pollution, including satellite data analyses, field experiments and model simulations, have been carried out over China in order to investigate the temporal and spatial characteristics of surface photochemical pollution (Lu and Wang, 2006; H. X. Tu et al, 2007;Zhang et al, 2007Zhang et al, , 2008Geng et al, 2008;Tang et al, 2008Tang et al, , 2009Chen et al, 2009;Han et al, 2011;Ding et al, 2013;Xie et al, 2016b), nonlinear photochemistry of O 3 and its precursors (Lam et al, 2005;Ran et al, 2009;Liu et al, 2010;Li et al, 2011;Xie et al, 2014), interactions between O 3 and aerosols (Lou et al, 2014;Shi et al, 2015), the effects of urbanization on O 3 formation Liao et al, 2015;Li et al, 2016;Xie et al, 2016a;Zhu et al, 2015) and other essential impact factors (Jiang et al, 2012;Li et al, 2012;Wei et al, 2012;Liu et al, 2013;Gao et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Integrated studies of a regional ozone pollution synthetically affected by subtropical high and typhoon system in the Yangtze River Delta region, China

et al. 2016

View full text Add to dashboard Cite

Abstract. Severe high ozone (O 3 ) episodes usually have close relations to synoptic systems. A regional continuous O 3 pollution episode was detected over the Yangtze River Delta (YRD) region in China during 7-12 August 2013, in which the O 3 concentrations in more than half of the cities exceeded the national air quality standard. The maximum hourly concentration of O 3 reached 167.1 ppb. By means of the observational analysis and the numerical simulation, the characteristics and the essential impact factors of the typical regional O 3 pollution are comprehensively investigated. The observational analysis shows that the atmospheric subsidence dominated by the western Pacific subtropical high plays a crucial role in the formation of high-level O 3 . The favorable weather conditions, such as extremely high temperature, low relative humidity and weak wind speed, caused by the abnormally strong subtropical high are responsible for the trapping and the chemical production of O 3 in the boundary layer. In addition, when the YRD cities are at the front of Typhoon Utor, the periphery circulation of typhoon system can enhance the downward airflows and cause worse air quality. However, when the typhoon system weakens the subtropical high, the prevailing southeasterly surface wind leads to the mitigation of the O 3 pollution. The integrated process rate (IPR) analysis incorporated in the Community Multi-scale Air Quality (CMAQ) model is applied to further illustrate the combined influence of subtropical high and typhoon system in this O 3 episode. The results show that the vertical diffusion (VDIF) and the gas-phase chemistry (CHEM) are two major contributors to O 3 formation. During the episode, the contributions of VDIF and CHEM to O 3 maintain the high values over the YRD region. On 10-12 August, the cities close to the sea are apparently affected by the typhoon system, with the contribution of VDIF increasing to 28.45 ppb h −1 in Shanghai and 19.76 ppb h −1 in Hangzhou. In contrast, the cities far away from the sea can hardly be affected by the periphery circulation of typhoon system. When the typhoon system significantly weakens the subtropical high, the contribution values of all individual processes decrease to a low level in all YRD cities. These results provide an insight for the O 3 pollution synthetically impacted by the western Pacific subtropical high and the tropical cyclone system.

show abstract

“…A similar interpretation, can also be given for the temperature, as decreases in temperature, which may be associated with cold weather, high wind speed or with high levels of rainfall, lead to traffic reduction and thus to air quality improvement. On the other hand, temperature, may increase pollution, especially, for O 3 , since is formed under sunlight, associated with high levels of solar radiation and temperature (Brook et al, 1993;Tai et al, 2010;Han et al, 2011;Barmpadimos et al, 2012;Kim et al, 2014;Zhang et al, 2015). However, the coefficient of the average temperature was found significant and positive only in the case of CO and O 3 .…”

Section: Regression Estimatesmentioning

confidence: 63%

Teleworking Effect on Traffic and Air Pollution

Giovanis¹

2017

Preprint

View full text Add to dashboard Cite

Traffic congestion is one of the foremost problems confronted by the urban and suburban tenants of today. Traffic congestion increases vehicle emissions and degrades air quality. Urban planners and policy makers have consequently been always investigating choices to alleviate traffic congestion and to enhance air quality. Teleworking is one option that has received significant consideration and has been studied in the recent past. The aim of the study is to explore the relationship between teleworking, air quality and traffic in Switzerland. The analysis relies on panel individual and household level data over the period 2002-2013. We examine five main air pollutants; the sulphur dioxide (SO 2 ), the ground-level ozone (O 3 ) the nitrogen dioxide (NO 2 ), the carbon monoxide (CO) and the particulate matter less than 10 microns (PM 10 ). Based on the fixed effects estimates, teleworking reduces traffic volume by 1.9 per cent. Furthermore, the reduction observed on air pollution is higher for NO 2 , CO and PM 10 ranging between 3.3-3.7 per cent, followed by O 3 at 2.3 per cent and SO 2 at 2.1 per cent. According to instrumental variable (IV) approach and the two stage least squares (2SLS) method, the effect is higher ranging between 2.6-4.1 per cent. The respective reduction on traffic becomes 2.7 per cent. Overall, the main concluding remark of the study is that teleworking can be a promising tool for urban planning and development, focusing at the traffic volume reduction, and the air quality improvement. Additional policy implications of teleworking and its beneficial effects for the society are further discussed.

show abstract

Analysis of the Relationship between O3, NO and NO2 in Tianjin, China

Cited by 272 publications

References 24 publications

The Influence of Spatial Variability of Critical Conversion Point (CCP) in Production of Ground Level Ozone in the Context of Tropical Climate

The Influence of Spatial Variability of Critical Conversion Point (CCP) in Production of Ground Level Ozone in the Context of Tropical Climate

Integrated studies of a regional ozone pollution synthetically affected by subtropical high and typhoon system in the Yangtze River Delta region, China

Teleworking Effect on Traffic and Air Pollution

Contact Info

Product

Resources

About