A model for estimation of traffic NOx emission rates from ambient NOx concentrations

It is important for controlling traffic air pollution in urban areas to estimate the ambient concentration of pollutants emitted from automobile exhausts. For this purpose, many diffusion models of exhaust gases have been developed and utilized. On the other hand, it is also important to measure the...

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Bibliographic Details
Published in:International journal of environmental studies 1992-08, Vol.41 (1-2), p.43-61
Main Authors: Ishikawa, Yoshinori, Nishida, Konosuke, Kitao, Takane
Format: Article
Language:English
Subjects:
Applied sciences
Atmospheric pollution
Exact sciences and technology
Pollutants physicochemistry study: properties, effects, reactions, transport and distribution
Pollution
Online Access:Get full text
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Summary:It is important for controlling traffic air pollution in urban areas to estimate the ambient concentration of pollutants emitted from automobile exhausts. For this purpose, many diffusion models of exhaust gases have been developed and utilized. On the other hand, it is also important to measure the emission rates of traffic pollutants in a certain area. However, the current methods to calculate emission rates from traffic volumes and emission factors are time-consuming and laborious. In Japan, for monitoring the traffic air pollution automatically, many monitoring sites have been set up along roads. We have tried to estimate traffic NO x (NO+NO 2 ) emission rates through processing the ambient NO x (NO+NO 2 ) concentrations and the wind data measured at some roadside monitoring sites. In this study a complete-mixing model has been devised to express the relationship between the ambient NO x concentrations and the emission rates of NO x gases from motor vehicles. Six roadside monitoring sites in the Osaka prefecture were selected to determine the model parameters and to examine the workability of the model. One result of this study is that the correlation coefficient values between the emission rates calculated from traffic volumes and emission factors and those estimated from the ambient NO x concentration using the complete-mixing model were higher than 0.87. Therefore, it seems to be possible to estimate NO x emission rates from ambient NO x concentrations at roadside monitoring sites using this simple estimation model.
ISSN:0020-7233
1029-0400
DOI:10.1080/00207239208710744