PMID: 15373367Sep 18, 2004Paper

Associations between particle number and gaseous co-pollutant concentrations in the Los Angeles Basin

Journal of the Air & Waste Management Association
Satya Brata SardarConstantinos Sioutas

Abstract

Continuous measurements of particle number (PN), particle mass (PM10), and gaseous pollutants [carbon monoxide (CO), nitric oxide (NO), oxides of nitrogen (NOx), and ozone (O3)] were performed at five urban sites in the Los Angeles Basin to support the University of Southern California Children's Health Study in 2002. The degree of correlation between hourly PN and concentrations of CO, NO, and nitrogen dioxide (NO2) at each site over the entire year was generally low to moderate (r values in the range of 0.1-0.5), with a few notable exceptions. In general, associations between PN and O3 were either negative or insignificant. Similar analyses of seasonal data resulted in levels of correlation with large variation, ranging from 0.0 to 0.94 depending on site and season. Summertime data showed a generally higher correlation between the 24-hr average PN concentrations and CO, NO, and NO2 than corresponding hourly concentrations. Hourly correlations between PN and both CO and NO were strengthened during morning rush-hour periods, indicating a common vehicular source. Comparing hourly particle number concentrations between sites also showed low to moderate spatial correlations, with most correlation coefficients below 0.4. Given the ...Continue Reading

References

Aug 28, 1999·Environmental Health Perspectives·R McConnellJ M Peters

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Citations

Aug 4, 2005·Journal of Exposure Science & Environmental Epidemiology·Manisha SinghConstantinos Sioutas
Aug 5, 2005·Environmental Health Perspectives·Constantinos SioutasManisha Singh
Dec 23, 2006·Environmental Health Perspectives·Rob McConnellJohn M Peters
Mar 10, 2009·Environmental Health Perspectives·Elinor W FanningTim V Larson
Mar 5, 2011·Environmental Science and Pollution Research International·Maria LianouGerard Hoek
Feb 3, 2018·Toxicological Sciences : an Official Journal of the Society of Toxicology·Emily M WongEdward S Schelegle
Jul 22, 2006·Environmental Science & Technology·Harish C PhuleriaConstantinos Sioutas

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