Document Detail


Short-term temporal variation in PM2.5 mass and chemical composition during the Atlanta Supersite Experiment, 1999.
MedLine Citation:
PMID:  12568257     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Measurements in urban Atlanta of transient aerosol events in which PM2.5 mass concentrations rapidly rise and fall over a period of 3-6 hr are reported. The data are based on new measurement techniques demonstrated at the U.S. Environmental Protection Agency (EPA) Atlanta Supersite Experiment in August 1999. These independent instruments for aerosol chemical speciation of NO3-, SO4(2-), NH4+, and organic and elemental carbon (OC and EC), reconstructed the observed hourly dry PM2.5 mass to within 20% or better. Data from the experiment indicated that transient PM2.5 events were ubiquitous in Atlanta and were typically characterized by a sudden increase of EC (soot) and OC in the early morning or SO4(2-) in the late afternoon. The frequent temporal decoupling of these events provides insights into their origins, suggesting mobile sources in metro Atlanta as the main contributor to early morning PM2.5 and more regionally located point SO2 sources for afternoon PM2.5 events. The transient events may also have health implications. New data suggest that short-term PM2.5 exposures may lead to adverse health effects. Standard integrated filter-based techniques used in PM2.5 compliance monitoring networks and in most past PM2.5 epidemiologic studies collect samples over 24-hr periods and thus are unable to capture these transient events. Moreover, health-effects studies that focus on daily PM2.5 mass alone cannot evaluate the health implications of the unique and variable chemical properties of these episodes.
Authors:
R Weber; M Bergin; C S Kiang; W Chameides; D Orsini; John J St; M Chang; M Bergin; C Carrico; Y N Lee; P Dasgupta; J Slanina; B Turpin; E Edgerton; S Hering; G Allen; P Solomon
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of the Air & Waste Management Association (1995)     Volume:  53     ISSN:  1096-2247     ISO Abbreviation:  J Air Waste Manag Assoc     Publication Date:  2003 Jan 
Date Detail:
Created Date:  2003-02-05     Completed Date:  2003-02-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9503111     Medline TA:  J Air Waste Manag Assoc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  84-91     Citation Subset:  IM    
Affiliation:
School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia, USA.
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MeSH Terms
Descriptor/Qualifier:
Aerosols / adverse effects,  analysis*
Air Pollutants / adverse effects,  analysis*
Cities
Environmental Monitoring
Georgia
Hazardous Waste*
Humans
Particle Size
Public Health
Time Factors
Chemical
Reg. No./Substance:
0/Aerosols; 0/Air Pollutants; 0/Hazardous Waste

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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