Repeat Fuel Specific Emission Measurements on Two California Heavy-Duty Truck Fleets

Haugen, Molly J.; Bishop, Gary A.

doi:10.1021/acs.est.6b06172

Cited by 23 publications

(41 citation statements)

References 21 publications

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“…Recent chassis dynamometer and portable testing of heavy-duty trucks show that under local/urban driving conditions, NO x emissions are significantly elevated relative to in-use certification limits ( 34 , 35 ). Recent roadside measurements of NO x emission factors ( 36 ) also indicate that the emission reductions from SCR systems may not be as large as anticipated by emission certification tests ( SI Appendix , Fig. S3 ).…”

Section: Resultsmentioning

confidence: 99%

Unexpected slowdown of US pollutant emission reduction in the past decade

Jiang

McDonald

Worden

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

174

179

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SignificanceEmissions of nitrogen oxides (NOx) have a large impact on air quality and climate change as precursors in the formation of ozone and secondary aerosols. We find that NOx emissions have not been decreasing as expected in recent years (2011–2015) when comparing top-down estimates from satellites and surface NO2 measurements to the trends predicted from the US Environmental Protection Agency’s emission inventory data. The discrepancy can be explained by the growing relative contribution of industrial, area, and off-road mobile sources of emissions, decreasing relative contribution of on-road gasoline vehicles, and slower than expected decreases in on-road diesel NOx emissions, with implications for air-quality management.

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Section: Resultsmentioning

confidence: 99%

Unexpected slowdown of US pollutant emission reduction in the past decade

Jiang

McDonald

Worden

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

174

179

View full text Add to dashboard Cite

show abstract

“…CO is directly emitted by vehicles, and CO emission from vehicles and urban activities have been reported in previous studies (for example Chaney, 1983;Stedman, 1989;Stremme et al, 2013;Haugen and Bishop, 2017). Among those studies, Bradley et al (2000) and Baldauf et al (2008) measured CO from traffic by open-path FTIR spectroscopy.…”

Section: Comparison Between Ftir Spectroscopy Naps and Gem-machmentioning

confidence: 89%

Long-path measurements of pollutants and micrometeorology over Highway 401 in Toronto

et al. 2017

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Abstract. Traffic emissions contribute significantly to urban air pollution. Measurements were conducted over Highway 401 in Toronto, Canada, with a long-path Fourier transform infrared (FTIR) spectrometer 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.

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Section: Comparison Between Ftir Spectroscopy Naps and Gem-machmentioning

confidence: 92%

Long-path measurements of pollutants and micrometeorology over Highway 401 in Toronto

You¹,

Staebler²,

Moussa³

et al. 2017

Preprint

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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&#8211;23&#8201;ppb) were observed, of which 76&#8201;% were associated with traffic emissions. Hydrogen cyanide was identified at mixing ratios between 0 and 4&#8201;ppb. Using a simple dispersion model, an integrated emission factor of on average 2.6&#8201;g&#8201;km&#8722;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&#8201;g&#8201;km&#8722;1 were calculated for ammonia, nitrogen oxide, and methanol respectively.

show abstract

Repeat Fuel Specific Emission Measurements on Two California Heavy-Duty Truck Fleets

Cited by 23 publications

References 21 publications

Unexpected slowdown of US pollutant emission reduction in the past decade

Unexpected slowdown of US pollutant emission reduction in the past decade

Long-path measurements of pollutants and micrometeorology over Highway 401 in Toronto

Long-path measurements of pollutants and micrometeorology over Highway 401 in Toronto

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