Skip common site navigation and headers
United States Environmental Protection Agency
Exposure Research
Begin Hierarchical Links EPA Home > Research & Development > Exposure Research > Publications/Presentations > End Hierarchical Links

 

Continuous Measurement of Fine and Ultrafine Particulate Matter, Criteria Pollutants and Meteorological Conditions in Urban El Paso, Texas

spacer
spacer
Abstract: Continuous measurements of aerosol size distributions were made in El Paso, TX, for a period in winter 1999. Size distribution measurements were performed at two urban locations in El Paso using two pairs of the scanning mobility particle sizer and the aerodynamic particle sizer. Complementary measurements also were performed for gas phase pollutants (CO, NO, NO2, O3) and meteorological conditions. Throughout the study, the mean ultrafine particle (those smaller than 0.1 um in diameter) number concentration was 14,400 particles cm-3. There was a significant correlation between CO and both ultrafine and accumulation mode (those between 0.1 and 1 um in diameter) particle count, with the Pearson correlation coefficient (r) values of 0.81 and 0.87, respectively. The correlation between NO and both ultrafine and accumulation mode particle count is also significant, but not as strong as the correlation of CO and the particle concentrations. Most pollutants were found to vary on diurnal cycles and to follow one of two different trends, either vehicular traffic schedules or sunlight intensity. Wind direction was found to have an influence not only on pollutant concentrations, but also on the correlation between pollutants. With southerly winds, CO, NO and NO2 concentrations were 25-140% greater than when the wind was coming from the north. Likewise, ultrafine and accumulation mode particle concentrations were approximately 100% greater for southerly than for northerly winds.

The US Environmental Protection Agency through its Office of Research and Development funded and managed the research described here under contract 68-D-99-012 to Research Triangle Institute and contract 68-D0-0206 to ManTech Environmental Technology, Inc. It has been subjected to Agency review and approved for publication. Mention of trade names or commercial products does not constitute an endorsement or recommendation for use.
spacer
Citation:Noble, C. A., S. Mukerjee, M. Gonzales, C. Rodes, P. A. Lawless, S. Natarajan, E. A. Myers, G. A. Norris, L. Smith, A. H. Ozkaynak, and L. Neas. Continuous Measurement of Fine and Ultrafine Particulate Matter, Criteria Pollutants and Meteorological Conditions in Urban El Paso, Texas. ATMOSPHERIC ENVIRONMENT 37(6):827-840, (2003).
spacer
spacer
Contact: Liz Hope - (919) 541-2785 or hope.elizabeth@epa.gov
spacer
Division: Human Exposure & Atmospheric Sciences Division
spacer
Branch: Exposure Modeling Research Branch
spacer
Product Type: Journal
spacer
Published: 02/01/2003
spacer
Downloads:
spacer
Bullet Item Continuous Measurement of Fine and Ultrafine Particulate Matter, Criteria Pollutants and Meteorological Conditions in Urban El Paso, Texas
spacer
spacer
Related Entries:
spacer
Bullet Item Measurement and Modeling of Air Pollutants in El Paso, Texas
spacer Relationship Reason:   A Project of the Product
spacer
spacer
spacer

 

ORD Home | Search EPA | Search NERL | Search EIMS | Contacts | Help

 
Begin Site Footer

EPA Home | Privacy and Security Notice | Contact Us

Last Updated on Monday, October 22, 2007
URL: http://cfpub.epa.gov