Articles | Volume 18, issue 23
https://doi.org/10.5194/acp-18-16979-2018
https://doi.org/10.5194/acp-18-16979-2018
Research article
 | 
30 Nov 2018
Research article |  | 30 Nov 2018

Elucidating real-world vehicle emission factors from mobile measurements over a large metropolitan region: a focus on isocyanic acid, hydrogen cyanide, and black carbon

Sumi N. Wren, John Liggio, Yuemei Han, Katherine Hayden, Gang Lu, Cris M. Mihele, Richard L. Mittermeier, Craig Stroud, Jeremy J. B. Wentzell, and Jeffrey R. Brook

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Cited articles

Air Pollutants Emission Inventory: Air Pollutants Emission Inventory online search, available at: https://pollution-waste.canada.ca/air-emission-inventory (last access: 18 April 2018), 2015. 
Akagi, S. K., Yokelson, R. J., Wiedinmyer, C., Alvarado, M. J., Reid, J. S., Karl, T., Crounse, J. D., and Wennberg, P. O.: Emission factors for open and domestic biomass burning for use in atmospheric models, Atmos. Chem. Phys., 11, 4039–4072, https://doi.org/10.5194/acp-11-4039-2011, 2011. 
Ambrose, J. L., Haase, K., Russo, R. S., Zhou, Y., White, M. L., Frinak, E. K., Jordan, C., Mayne, H. R., Talbot, R., and Sive, B. C.: A comparison of GC-FID and PTR-MS toluene measurements in ambient air under conditions of enhanced monoterpene loading, Atmos. Meas. Tech., 3, 959–980, https://doi.org/10.5194/amt-3-959-2010, 2010. 
Ambrose, J. L., Zhou, Y., Haase, K., Mayne, H. R., Talbot, R., and Sive, B. C.: A gas chromatographic instrument for measurement of hydrogen cyanide in the lower atmosphere, Atmos. Meas. Tech., 5, 1229–1240, https://doi.org/10.5194/amt-5-1229-2012, 2012. 
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Short summary
We made measurements from a mobile laboratory across a large urban area and determined fleet-average vehicle emission factors (EFs) for a suite of traffic-related air pollutants. We present the first real-world EFs for isocyanic acid (HNCO) and hydrogen cyanide (HCN) and insight into their on-road variability. We find that vehicles may represent an important source of these air toxics at an urban scale. This work has implications for understanding population exposure to these species.
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