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- W4230552621 abstract "Abstract. Traffic emissions contribute significantly to urban air pollution. Measurements were conducted over Highway 401 in Toronto, Canada, with a long-path Fourier Transform Infra-Red Spectrometer (FTIR) combined with a suite of micrometeorological instruments, to identify and quantify a range of air pollutants. Results were compared with simultaneous in-situ observations at a roadside monitoring station, and with output from a special version of the operational Canadian air quality forecast model (GEM-MACH). Elevated mixing ratios of ammonia (0–23 ppb) were observed, of which 76 % were associated with traffic emissions. Hydrogen cyanide was identified at mixing ratios between 0 and 4 ppb. Using a simple dispersion model, an integrated emission factor of on average 2.6 g km−1 carbon monoxide was calculated for this defined section of Highway 401, which agreed well with estimates based on vehicular emission factors and observed traffic volumes. Based on the same dispersion calculations, vehicular average emission factors of 0.04, 0.36 and 0.15 g km−1 were calculated for ammonia, nitrogen oxide, and methanol respectively." @default.
- W4230552621 created "2022-05-11" @default.
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- W4230552621 date "2017-05-03" @default.
- W4230552621 modified "2023-09-27" @default.
- W4230552621 title "Long-path measurements of pollutants and micrometeorology over Highway 401 in Toronto" @default.
- W4230552621 doi "https://doi.org/10.5194/acp-2017-328" @default.
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