Kinetics of the reaction of nitrogen dioxide with ozone

Cox, R. A.; Coker, G. B.

doi:10.1007/bf00113979

Cited by 32 publications

(21 citation statements)

References 17 publications

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“…For instance, the heterogeneous reaction of NO 2 with PAHs will lead to the formation of nitro-PAHs, which have been classified as mutagenic and carcinogenic agents, and continued concern due to their 200,000 times higher mutagenicity and 10 times higher carcinogenicity compared to PAHs (IARC, 1998;Bamford et al, 2003). Some kinetics of the reactions of NO 2 with O 3 coupled with particle formation from homogeneous reactions of SO 2 and NO 2 can significantly alter the level of air pollutants and thus inevitably affect the hospitalizations (Cox, 1973;Cox and Coker, 1983).…”

Section: Influences Of Gender and Age On Opd And Ipd Patient Numbersmentioning

confidence: 99%

Hospital out-and-in-patients as Functions of Trace Gaseous Species and Other Meteorological Parameters in Chiang-Mai, Thailand

Pongpiachan

Paowa

2015

Aerosol Air Qual. Res.

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The aims of this study were to investigate the impact of meteorological parameters and trace gas concentrations on daily hospital walk-ins and admissions in Chiang-Mai province, Thailand, during 2007Thailand, during -2013. Advanced statistical models, including t-tests, Analysis of Variance (ANOVA), Multiple Linear Regression Analysis (MLRA) and Incremental Lifetime Particulate Matter Exposure (ILPE), were constructed using meteorological data from the Pollution Control Department (PCD), Ministry of Natural Resources and Environment (MNRE), Thailand, and the Thai Meteorological Department at Chiang-Mai Province Air Quality Observatory Site (TMCS) as well as the number of walk-in and admitted patients at Nakornping Hospital, Chiang-Mai (NHCM). The results showed that all trace gaseous species and PM 10 were significantly higher during the "haze episode" than during the "non-haze period." The FTIR spectra highlight the relatively homogeneous organic functional compositions of PM 2.5 collected from urban, suburban and rural observatory sites, indicating that agricultural waste burning plays an important role in air quality during the "haze episode." The effect of age on susceptibility to respiratory diseases was investigated by separating the dataset into four groups (i.e., < 15 years, 15-59 years, 60-74 years and ≥ 75 years). The ANOVA results revealed a significant increase in hospital walk-ins and admissions for both genders in the < 15 years group (p < 0.005). MLRA revealed the significantly highest impacts of CO on hospital walk-ins for both genders. The predicted ILPE of PM 10 showed the highest values for both genders during the "haze-episode" in 2007, with average values of 3.338 ± 0.576 g and 1.838 ± 0.317 g for male and female outdoor workers, respectively, over an exposure duration of 25 years.

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Section: Influences Of Gender and Age On Opd And Ipd Patient Numbersmentioning

confidence: 99%

Hospital out-and-in-patients as Functions of Trace Gaseous Species and Other Meteorological Parameters in Chiang-Mai, Thailand

Pongpiachan

Paowa

2015

Aerosol Air Qual. Res.

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“…Because of its important implications for atmospheric chemistry, considerable research effort has been devoted to measure the rate of reaction (1). A number of studies12–21 have determined the rate coefficient to be within the range 3.2 × 10 −17 –3.8 × 10 −17 cm 3 molecule −1 s −1 . On the basis of the temperature dependence of reaction (1), activation energies within the range 4.8–5.0 kcal mol −1 are obtained.…”

Section: Introductionmentioning

confidence: 99%

Ab initio study of the mechanism of the atmospheric reaction: NO₂ + O₃ → NO₃ + O₂

Peiró-Garcı́a

Nebot–Gil

2003

J Comput Chem

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The atmospheric reaction NO2 + O3 --> NO3 + O2 (1) has been investigated theoretically by using the MP2, G2, G2Q, QCISD, QCISD(T), CCSD(T), CASSCF, and CASPT2 methods with various basis sets. The results show that the reaction pathway can be divided in two different parts at the MP2 level of theory. At this level, the mechanism proceeds along two transition states (TS1 and TS2) separated by an intermediate, designated as A. However, when the single-reference higher correlated QCISD methodology has been employed, the minimum A and the transition state TS2 are not found on the hypersurface of potential energy, which confirms a direct reaction mechanism. Single-reference high correlated and multiconfigurational methods consistently predict the barrier height of reaction (1) to be within the range 2.5-6.1 kcal mol(-1), in reasonable agreement with experimental data. The calculated reaction enthalpy is -24.6 kcal mol(-1) and the reaction rate calculated at the highest CASPT2 level, of k = 6.9 x 10(-18) cm(3) molecule(-1) s(-1). Both results can be regarded also as accurate predictions of the methodology employed in this article.

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“…The production of HNO 3 in clouds initiated by a gas-phase reaction of NO 2 with O 3 and resulting in the formation of NO 3and/or N20 5, followed by the rapid dissolution of these products in cloud water, has been postulated as the most likely in-cloud NO,• oxidation process. Calculated rates for this process using realistic concentrations indicate that it could contribute substantially to cloud water composition, particularly during hours of darkness and at cold temperatures [Richards, 1983;Cox and Coker, 1983;Heikes and Thompson, 1983;Chang, 1986;Charneides, 1986;Chang et al, 1987]. However, to date, evidence for this reaction from field studies is limited; no nighttime cloud studies have been reported.…”

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confidence: 99%

Winter cloud water and air composition in central Ontario

Strapp¹,

Leaitch²,

Anlauf³

et al. 1988

J. Geophys. Res.

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Time histories of surface air composition and cloud water composition in winter in Central Ontario are compared in order to establish a winter data set for this region, and to identify dominant processes responsible for the incorporation of sulfate, nitrate, and acidity into cloud water. Cloud water comparisons are restricted to low‐level collections (median altitude 625 m above ground) within the boundary layer. Surface level measurements during the 6‐week period show a variety of conditions, including several episodes of elevated concentrations of SO2, NO3−, HNO3, aerosol SO4=, and occasionally aerosol NO3−. Nitric acid comprised the majority of soluble acidity at ground level more than half the time, and was relatively more important during the periods of elevated SO4 = and NO3− concentrations. Examination of cloud water composition indicated that HNO3 was also the dominant contributor to cloud water acidity on the majority of days sampled. Comparisons of air and cloud water absolute concentrations and concentration ratios suggest that aqueous SO2 oxidation was of minor importance in determining cloud composition. The conclusion is supported by measurements of hydrogen peroxide in cloud water samples. Cloud water NO3−/SO4 = ratios were found to exceed (HNO3 + aerosol NO3−)/SO4= ratios in air at the surface in most cases, and in a few instances cloud water NO3− concentrations were higher than expected based on the surface air composition data; several possible causes for this observation are discussed. It is concluded that in this region in winter, the composition of low‐level clouds can be estimated to within a factor of 2 by measurements of air composition at the surface, and that dissolution of soluble aerosol and gaseous species is primarily responsible for cloud composition. In‐cloud SO2 oxidation is found to be of minor significance, but the data may indicate in‐cloud production of HNO3 in some cases.

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Kinetics of the reaction of nitrogen dioxide with ozone

Cited by 32 publications

References 17 publications

Hospital out-and-in-patients as Functions of Trace Gaseous Species and Other Meteorological Parameters in Chiang-Mai, Thailand

Hospital out-and-in-patients as Functions of Trace Gaseous Species and Other Meteorological Parameters in Chiang-Mai, Thailand

Ab initio study of the mechanism of the atmospheric reaction: NO₂ + O₃ → NO₃ + O₂

Winter cloud water and air composition in central Ontario

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Kinetics of the reaction of nitrogen dioxide with ozone

Cited by 32 publications

References 17 publications

Hospital out-and-in-patients as Functions of Trace Gaseous Species and Other Meteorological Parameters in Chiang-Mai, Thailand

Hospital out-and-in-patients as Functions of Trace Gaseous Species and Other Meteorological Parameters in Chiang-Mai, Thailand

Ab initio study of the mechanism of the atmospheric reaction: NO2 + O3 → NO3 + O2

Winter cloud water and air composition in central Ontario

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Ab initio study of the mechanism of the atmospheric reaction: NO₂ + O₃ → NO₃ + O₂