PMID- 15468661
OWN - NLM
STAT- MEDLINE
DCOM- 20041026
LR  - 20190911
IS  - 1096-2247 (Print)
IS  - 1096-2247 (Linking)
VI  - 54
IP  - 9
DP  - 2004 Sep
TI  - Characterization of ultrafine particle number concentration and size distribution 
      during a summer campaign in southwest Detroit.
PG  - 1079-90
AB  - This paper presents results from a study conducted in southwest Detroit from July 
      20 to July 30, 2002, to characterize ambient ultrafine particles (dP < 0.1 
      microm), and to examine the effect of local sources and meteorological parameters 
      on the ultrafine number concentration and size distribution. The number 
      concentrations of ambient particles in the size range of 0.01-0.43 microm were 
      obtained from a scanning mobility particle sizer (SMPS). Meteorological 
      parameters including ambient temperature, relative humidity, wind speed, wind 
      direction, rainfall, and solar radiation flux were also monitored concurrently 
      atop a 10-m tower. On average, ultrafine particles ranged from 1.4 x 10(4) to 2.5 
      x 10(4) cm(-3), with significant diurnal and daily variations, and accounted for 
      approximately 89% of the total number concentration (0.01 < dP < 0.43 microm). 
      Time-series plots of the 5-min number concentrations revealed that peak 
      concentrations often occurred during morning rush hour and/or around solar noon 
      when photochemical activity was at a maximum. The morning traffic-related peak 
      coincided with the NOx peak, whereas the photochemical-related peak correlated 
      with solar radiation flux. On some days, the noon peak concentration was many 
      times higher than the morning peak concentration. Although the number size 
      distribution varied considerably over the course of the study, it typically 
      exhibited one to three modes, with diameters around 0.01, 0.05, and 0.09 microm. 
      Analysis of the influence of wind direction indicated that stationary sources 
      could be one of the contributors to elevated ultrafine particle concentration. 
      Overall, the data indicated that fossil fuel combustion and atmospheric 
      gas-to-particle conversion of precursor gases are the major sources of ultrafine 
      particles in the southwest Detroit area during the summer.
FAU - Young, Li-Hao
AU  - Young LH
AD  - Department of Environmental Health Sciences and Department of Atmospheric, 
      Oceanic, and Space Sciences, University of Michigan, Ann Arbor 48109, USA.
FAU - Keeler, Gerald J
AU  - Keeler GJ
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - J Air Waste Manag Assoc
JT  - Journal of the Air & Waste Management Association (1995)
JID - 9503111
RN  - 0 (Air Pollutants)
SB  - IM
MH  - Air Pollutants/*analysis
MH  - Cities
MH  - Meteorological Concepts
MH  - Michigan
MH  - Particle Size
MH  - Seasons
MH  - Time Factors
EDAT- 2004/10/08 09:00
MHDA- 2004/10/27 09:00
CRDT- 2004/10/08 09:00
PHST- 2004/10/08 09:00 [pubmed]
PHST- 2004/10/27 09:00 [medline]
PHST- 2004/10/08 09:00 [entrez]
AID - 10.1080/10473289.2004.10470987 [doi]
PST - ppublish
SO  - J Air Waste Manag Assoc. 2004 Sep;54(9):1079-90. doi: 
      10.1080/10473289.2004.10470987.