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Updated: Mar 9, 2026

Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx
Published on: December 20, 2016
The Plume Volume Molar Ratio Method for Determining NO2/NOx Ratios in Modeling-Part II: Evaluation Studies
1a Air Quality Division , Oregon Department of Environmental Quality , Portland , Oregon , USA.
Abstract:
A previous paper1 discusses the methodology for a new method for deriving the nitrogen dioxide/nitrogen oxide (NO2/NOx) ratio in plumes that originally are composed mainly of (NOx). It is called the Plume Volume Molar Ratio Method (PVMRM). This paper documents its performance against six different data sets. These performance evaluations show that the PVMRM can realistically predict the NO2 fraction at close-in receptors yet still provide conservative estimates so that the air quality standards can be protected.
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