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Characteristics of NO2 Pollution in the City of Gothenburg, South-West Sweden—Relation to NO x and O3 Levels, Photochemistry and Monitoring Location

Journal article
Authors Håkan Pleijel
Jenny Klingberg
Erik Bäck
Published in Water, Air, & Soil Pollution: Focus
Volume 9
Issue 1-2
Pages 15-25
ISSN 1567-7230 (Print) 1573-2940 (Online)
Publication year 2009
Published at Department of Plant and Environmental Sciences
Pages 15-25
Language en
Links www.springerlink.com.ezproxy.ub.gu....
Keywords Gothenburg, Nitrogen dioxide, Nitrogen monoxide, Oxidant, Ozone, Photochemistry, Primary NO2 fraction, Urban air pollution
Subject categories Environmental chemistry, Meteorology and Atmospheric Sciences

Abstract

Concentrations of NO2, NO, and O3 from a rooftop monitoring station in Gothenburg, Sweden (2002–2006) were analysed to characterise NO2 pollution. [NO2] was shown to correlate strongly and non-linearly with [NO x ] (NO x  = NO + NO2), in line with observations in other cities. The [NO2] to [NO x ] fraction fell initially with increasing [NO x ]. At [NO x ] levels >200 ppb, the decline in [NO2]/[NO x ] with increasing [NO x ] levelled out and [NO2]/[NO x ] converged towards approximately 0.15–0.16, independent of [NO x ]. Data from a traffic route site showed the same pattern. This value of [NO2]/[NO x ] at high [NO x ] can be interpreted as the NO2 fraction of the NO x emissions from vehicle exhaust. Situations with high NO x pollution and minimum [NO2]/[NO x ] were always associated with [O3] close to zero. Plotting [Ox] (Ox = NO2 + O3) vs. [NO x ] provided a strong linear correlation for situations dominated by local pollution ([NO]/[NO2]>1). The slope of the regression, a measure of the primary NO2 fraction in NO x emissions, was 0.13 during the day and 0.14 during the night. With stronger winds, the rooftop monitoring station became more similar, in terms of NO2 pollution, to a city street site and a traffic route site, although [NO2] was almost always higher at the street/traffic route locations. The EU standard for the annual average of [NO2] (40 μg m−3) was exceeded, while the hourly standard (200 μg m−3, not to be exceeded more than 18 times per year by 2010) was not exceeded at any of the sites.

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