Correlation between Light Intensity and Ozone Formation for Photochemical Smog in Urban Air of Seoul

Seung-Bok, Lee; Bae, Gwi–Nam; Young-Mee, Lee; Moon, Kyung Chul; Choi, Man-Young

doi:10.4209/aaqr.2010.05.0036

Cited by 27 publications

(14 citation statements)

References 21 publications

(23 reference statements)

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“…The rate of reaction is dependent on the downward solar flux which is proportional to the latitude-longitude, altitude, time of the day and other radiative factors (Walcek and Yuan 1995). Further, chamber experiments also suggested that the immediate NO 2 photolysis when exposed to irradiation resulted in formation of O 3 , and the rate of O 3 formation correlates linearly with radiation flux (Lee et al 2010). Therefore, measurement of solar radiation at the study site was important, and the observed surface O 3 concentrations showed a positive correlation with solar flux (Table 2).…”

Section: Meteorological Observationsmentioning

confidence: 94%

Environmental monitoring of surface ozone and other trace gases over different time scales: chemistry, transport and modeling

Venkanna

Nikhil

Rao

et al. 2014

Int. J. Environ. Sci. Technol.

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Increasing concentration of tropospheric ozone (O 3 ) is a serious air pollution problem faced commonly by the urban people. The present study emphasizes on variations of air pollutant concentrations viz., O 3 , nitrogen oxides (NO x ), carbon monoxide (CO), sulfur dioxide (SO 2 ) and black carbon (BC) at a tropical urban site located in the Deccan plateau region with semi-arid climate. The air monitoring site revealed typical diurnal/seasonal trends attributing to the complex chemistry of surface O 3 formation from its precursors. Role of SO 2 in the formation of free radical (HO Á 2 ) and its impact on O 3 concentration is distinguished part of the study. The results showed the highest mean O 3 in summer (57.5 ± 15.2 ppbv) followed by winter and monsoon. Observations of BC aerosols showed the highest mean value during winter (8.2 ± 2 lg m -3 ) and the lowest in monsoon (4.2 ± 1 lg m -3 ). Besides local influences, long-range transport of air masses were also studied by simulating back trajectories at different elevations during the study period. Furthermore, statistical analysis and modeling was performed with both linear (regression) and nonlinear (neural network) methods.

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Section: Meteorological Observationsmentioning

confidence: 94%

Environmental monitoring of surface ozone and other trace gases over different time scales: chemistry, transport and modeling

Venkanna

Nikhil

Rao

et al. 2014

Int. J. Environ. Sci. Technol.

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“…Moreover, major ambient air pollutants in metro Kaohsiung are mostly higher than that those at other AQZs in Taiwan (Tsai et al, 2008). Among them, O 3 and PM 10 are two major air pollutants that are responsible for poor air quality in metro city (Cheng et al, 2010;Chakraborty and Gupta, 2010;Huang et al, 2010;Lee et al, 2010;Reddy et al, 2011;Stone et al, 2011). Previous investigators reported that high O 3 concentration formation had a relationship with nitrogen oxides and hydrocarbon emissions, and under certain weather conditions (eg.…”

Section: Introductionmentioning

confidence: 99%

Vertical Profile and Spatial Distribution of Ozone and Its Precursors at the Inland and Offshore of an Industrial City

Tsai

Liu

Yuan

et al. 2012

Aerosol Air Qual. Res.

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This study investigated the ozone formation mechanism and air mass trajectory via simultaneous air quality sampling around the coastal region of urban Kaohsiung. Vertical concentration profiles of O 3 and its precursors (NO x and VOCs) were sampled and measured at inland and offshore sites during eight intensive sampling periods. The intensive sampling periods were divided into three categories based on meteorological condition: the sea-land breeze period, the northeastern monsoon period, and the mixed period. Vertical profile results showed that the stratification of O 3 was commonly observed at 40 out of 64 sampling sites accounting for 62.5% of the total O 3 measurement. The results obtained from VOCs measurement indicated that the major species of VOCs was acetone, which accounted for 16.25-64.05% of total TVOCs-C 2 in the offshore region, while the major species of VOCs in the inland region was toluene, which accounted for 6.41-43.77 % of total TVOCs-C 2 . Backward trajectories showed that air pollutants emitted from land sources could transport to the offshore region, resulting in a high concentration of oversea NO x and VOCs. Major species of VOCs with high O 3 formation potential were found to be aromatics in the low atmosphere around the coastal region of metro Kaohsiung.

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“…The ozone-VOC-NO x sensitivity can be determined directly from measurements and from models. (Peng et al, 2006;Kumar et al, 2008;Tseng et al, 2009a;Tseng et al, 2009b;Lee et al, 2010) However, threedimensional photochemical model simulations for evaluations of ozone-VOC-NO x sensitivity are difficult because of the uncertainties of model assumptions, e.g., emission inventory and meteorology (Fujita et al, 1992;Sillman, 1995;Bishoi et al, 2009). Several alternative approaches have been developed to determine the ozone sensitivity.…”

Section: Introductionmentioning

confidence: 99%

In Situ Measurements of Hydrogen Peroxide, Nitric Acid and Reactive Nitrogen to Assess the Ozone Sensitivity in Pingtung County, Taiwan

Peng

Chen

Wang

et al. 2011

Aerosol Air Qual. Res.

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This study was aimed to investigate the concentration of hydrogen peroxide (H 2 O 2 ), nitric acid (HNO 3 ) and reactive nitrogen (NO y ) at three sites in Southern Taiwan during [2003][2004]. The mean H 2 O 2 concentrations were 1.0-2.7 ppbv, 1.6-2.8 ppbv and 1.0-2.6 ppbv at Pingtung, Chao-Chou and Kenting, respectively. Meanwhile, the mean HNO 3 concentrations were 2.7-5.5 ppbv at Pingtung, 1.9-4.6 ppbv at Chao-Chou and 1.2-3.0 ppbv at Kenting. The NO y mean concentrations were 61.0-85.0 ppbv, 16.0-75.0 ppbv and 4.2-12.0 ppbv at Pingtung, Chao-Chou and Kenting, respectively. The hourly data of H 2 O 2 , HNO 3 , NO y and O 3 were then used to determine the ratio of H 2 O 2 to HNO 3 , O 3 to HNO 3 , O 3 to NO y and the extent of reaction (E) in Smog Production Model (SPM) to evaluate the NO x and VOC sensitivity of ozone formation in Southern Taiwan. The results show that Pingtung city was primarily VOC-sensitive regime in four seasons. At Chao-Chou, the percentages of VOC-sensitive regime exceed those in NO x -sensitive regime in H 2 O 2 /HNO 3 and O 3 /NO y in four seasons; but O 3 /HNO 3 indicates NO x -sensitive regime in autumn, winter and spring. Kenting was mainly dominated by NO x -sensitive by use of three indicators in four seasons. The SPM results are consistent with those determined by the photochemical indicator ratios although the percentages of dominance may vary among these analyses.

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Correlation between Light Intensity and Ozone Formation for Photochemical Smog in Urban Air of Seoul

Cited by 27 publications

References 21 publications

Environmental monitoring of surface ozone and other trace gases over different time scales: chemistry, transport and modeling

Environmental monitoring of surface ozone and other trace gases over different time scales: chemistry, transport and modeling

Vertical Profile and Spatial Distribution of Ozone and Its Precursors at the Inland and Offshore of an Industrial City

In Situ Measurements of Hydrogen Peroxide, Nitric Acid and Reactive Nitrogen to Assess the Ozone Sensitivity in Pingtung County, Taiwan

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