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Apportionment of motor vehicle emissions from fast changes in number concentration and chemical composition of ultrafine particles near a roadway intersection.
Environ Sci Technol 2011; 45(13):5637-43ES

Abstract

High frequency spikes in ultrafine number concentration near a roadway intersection arise from motor vehicles that accelerate after a red light turns green. The present work describes a method to determine the contribution of motor vehicles to the total ambient ultrafine particle mass by correlating these number concentration spikes with fast changes in ultrafine particle chemical composition measured with the nano aerosol mass spectrometer, NAMS. Measurements were performed at an urban air quality monitoring site in Wilmington, Delaware during the summer and winter of 2009. Motor vehicles were found to contribute 48% of the ultrafine particle mass in the winter measurement period, but only 16% of the ultrafine particle mass in the summer period. Chemical composition profiles and contributions to the ultrafine particle mass of spark vs diesel vehicles were estimated by correlating still camera images, chemical composition and spike contribution at each time interval.. The spark and diesel contributions were roughly equal, but the uncertainty in the split was large. The distribution of emissions from individual vehicles was determined by correlating camera images with the spike contribution to particle number concentration at each time interval. A small percentage of motor vehicles were found to emit a disproportionally large concentration of ultrafine particles, and these high emitters included both spark ignition and diesel vehicles.

Authors+Show Affiliations

Department of Chemistry and Biochemistry, University of Delaware , Newark, Delaware 19716, United States.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21667963

Citation

Klems, Joseph P., et al. "Apportionment of Motor Vehicle Emissions From Fast Changes in Number Concentration and Chemical Composition of Ultrafine Particles Near a Roadway Intersection." Environmental Science & Technology, vol. 45, no. 13, 2011, pp. 5637-43.
Klems JP, Pennington MR, Zordan CA, et al. Apportionment of motor vehicle emissions from fast changes in number concentration and chemical composition of ultrafine particles near a roadway intersection. Environ Sci Technol. 2011;45(13):5637-43.
Klems, J. P., Pennington, M. R., Zordan, C. A., McFadden, L., & Johnston, M. V. (2011). Apportionment of motor vehicle emissions from fast changes in number concentration and chemical composition of ultrafine particles near a roadway intersection. Environmental Science & Technology, 45(13), pp. 5637-43. doi:10.1021/es104228q.
Klems JP, et al. Apportionment of Motor Vehicle Emissions From Fast Changes in Number Concentration and Chemical Composition of Ultrafine Particles Near a Roadway Intersection. Environ Sci Technol. 2011 Jul 1;45(13):5637-43. PubMed PMID: 21667963.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Apportionment of motor vehicle emissions from fast changes in number concentration and chemical composition of ultrafine particles near a roadway intersection. AU - Klems,Joseph P, AU - Pennington,M Ross, AU - Zordan,Christopher A, AU - McFadden,Lauren, AU - Johnston,Murray V, Y1 - 2011/06/13/ PY - 2011/6/15/entrez PY - 2011/6/15/pubmed PY - 2011/11/9/medline SP - 5637 EP - 43 JF - Environmental science & technology JO - Environ. Sci. Technol. VL - 45 IS - 13 N2 - High frequency spikes in ultrafine number concentration near a roadway intersection arise from motor vehicles that accelerate after a red light turns green. The present work describes a method to determine the contribution of motor vehicles to the total ambient ultrafine particle mass by correlating these number concentration spikes with fast changes in ultrafine particle chemical composition measured with the nano aerosol mass spectrometer, NAMS. Measurements were performed at an urban air quality monitoring site in Wilmington, Delaware during the summer and winter of 2009. Motor vehicles were found to contribute 48% of the ultrafine particle mass in the winter measurement period, but only 16% of the ultrafine particle mass in the summer period. Chemical composition profiles and contributions to the ultrafine particle mass of spark vs diesel vehicles were estimated by correlating still camera images, chemical composition and spike contribution at each time interval.. The spark and diesel contributions were roughly equal, but the uncertainty in the split was large. The distribution of emissions from individual vehicles was determined by correlating camera images with the spike contribution to particle number concentration at each time interval. A small percentage of motor vehicles were found to emit a disproportionally large concentration of ultrafine particles, and these high emitters included both spark ignition and diesel vehicles. SN - 1520-5851 UR - https://www.unboundmedicine.com/medline/citation/21667963/Apportionment_of_motor_vehicle_emissions_from_fast_changes_in_number_concentration_and_chemical_composition_of_ultrafine_particles_near_a_roadway_intersection_ L2 - https://dx.doi.org/10.1021/es104228q DB - PRIME DP - Unbound Medicine ER -