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Ultrafine particles near a roadway intersection: origin and apportionment of fast changes in concentration.
Environ Sci Technol 2010; 44(20):7903-7ES

Abstract

A wavelet-based algorithm was implemented to separate the high frequency portion of ambient nanoparticle measurements taken during the summer and winter of 2009 in Wilmington, Delaware. These measurements included both number concentration and size distributions recorded once every second by a condensation particle counter (CPC) and a fast mobility particle sizer (FMPS). The high frequency portion of the signal, consisting of a series of abrupt spikes in number concentration that varied in length from a few seconds to tens of seconds, accounted for 6-35% of the daily ambient number concentration with hourly contributions sometimes greater than 50%. When the data were weighted by particle volume, this portion of the signal contributed an average of 20% to the daily PM(0.1) concentration. Particle concentration spikes were preferentially observed from locations surrounding the measurement site where motor vehicles accelerate after a red traffic light turns green. As the distance or transit time from emission to sampling increased, the size distribution shifted to larger particle diameters.

Authors+Show Affiliations

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

Pub Type(s)

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

Language

eng

PubMed ID

20843065

Citation

Klems, Joseph P., et al. "Ultrafine Particles Near a Roadway Intersection: Origin and Apportionment of Fast Changes in Concentration." Environmental Science & Technology, vol. 44, no. 20, 2010, pp. 7903-7.
Klems JP, Pennington MR, Zordan CA, et al. Ultrafine particles near a roadway intersection: origin and apportionment of fast changes in concentration. Environ Sci Technol. 2010;44(20):7903-7.
Klems, J. P., Pennington, M. R., Zordan, C. A., & Johnston, M. V. (2010). Ultrafine particles near a roadway intersection: origin and apportionment of fast changes in concentration. Environmental Science & Technology, 44(20), pp. 7903-7. doi:10.1021/es102009e.
Klems JP, et al. Ultrafine Particles Near a Roadway Intersection: Origin and Apportionment of Fast Changes in Concentration. Environ Sci Technol. 2010 Oct 15;44(20):7903-7. PubMed PMID: 20843065.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Ultrafine particles near a roadway intersection: origin and apportionment of fast changes in concentration. AU - Klems,Joseph P, AU - Pennington,M Ross, AU - Zordan,Christopher A, AU - Johnston,Murray V, PY - 2010/9/17/entrez PY - 2010/9/17/pubmed PY - 2011/2/2/medline SP - 7903 EP - 7 JF - Environmental science & technology JO - Environ. Sci. Technol. VL - 44 IS - 20 N2 - A wavelet-based algorithm was implemented to separate the high frequency portion of ambient nanoparticle measurements taken during the summer and winter of 2009 in Wilmington, Delaware. These measurements included both number concentration and size distributions recorded once every second by a condensation particle counter (CPC) and a fast mobility particle sizer (FMPS). The high frequency portion of the signal, consisting of a series of abrupt spikes in number concentration that varied in length from a few seconds to tens of seconds, accounted for 6-35% of the daily ambient number concentration with hourly contributions sometimes greater than 50%. When the data were weighted by particle volume, this portion of the signal contributed an average of 20% to the daily PM(0.1) concentration. Particle concentration spikes were preferentially observed from locations surrounding the measurement site where motor vehicles accelerate after a red traffic light turns green. As the distance or transit time from emission to sampling increased, the size distribution shifted to larger particle diameters. SN - 1520-5851 UR - https://www.unboundmedicine.com/medline/citation/20843065/Ultrafine_particles_near_a_roadway_intersection:_origin_and_apportionment_of_fast_changes_in_concentration_ L2 - https://dx.doi.org/10.1021/es102009e DB - PRIME DP - Unbound Medicine ER -