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Street canyon concentrations of nitrogen dioxide in Oslo. Measurements and model calculations

Oeystein. Hoy, Steinar Larssen

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Abstract

Nitrogen dioxide in the concentration ranges measured in a street canyon in Oslo in January 1981 (up to 300 ppb) is explained by a combination of mixing with aloft air, the reactions NO+O3→NO2+O2 and NO+NO+O2→NO2+NO2, and the direct release of NO2 in the car exhaust. The measurements showed that the ratio NO2/NOx fell between 0.10 and 0.30 (volume) when the NO2 concentration was high.

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Nitrogen dioxide in the concentration ranges measured in a street canyon in Oslo in January 1981 (up to 300 ppb) is explained by a combination of mixing with aloft air, the reactions NO+O3→NO2+O2 and NO+NO+O2→NO2+NO2, and the direct release of NO2 in the car exhaust. The measurements showed that the ratio NO2/NOx fell between 0.10 and 0.30 (volume) when the NO2 concentration was high.

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Available abstract

Nitrogen dioxide in the concentration ranges measured in a street canyon in Oslo in January 1981 (up to 300 ppb) is explained by a combination of mixing with aloft air, the reactions NO+O3→NO2+O2 and NO+NO+O2→NO2+NO2, and the direct release of NO2 in the car exhaust. The measurements showed that the ratio NO2/NOx fell between 0.10 and 0.30 (volume) when the NO2 concentration was high.

Key concepts: Nitrogen dioxide, Canyon, Environmental science, Street canyon, Sulfur dioxide, Nitrogen, Environmental chemistry, Atmospheric sciences

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