Ambient Endotoxin Concentrations in PM10 from Southern California.

Linda Mueller-Anneling; Ed Avol; John M. Peters; Peter S Thorne

doi:10.1289/ehp.6552

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Ambient Endotoxin Concentrations in PM10 from Southern California.

Journal article

Open access

Peer reviewed

Ambient Endotoxin Concentrations in PM10 from Southern California.

Linda Mueller-Anneling, Ed Avol, John M. Peters and Peter S Thorne

Environmental Health Perspectives, Vol.112(5), pp.583-588

04/01/2004

DOI: 10.1289/ehp.6552

PMCID: PMC1241925

PMID: 15064165

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Published (Version of record)Environmental Health Perspectives, 112:5 (2004) pp.583-588.

Abstract

<p>Concentrations of endotoxin in urban air pollution have not previously been extensively characterized. We measured 24-hr levels of PM10 (particulate matter < 10 microm in aerodynamic diameter) and the associated endotoxin component once every 6 weeks for 1 year in 13 communities in Southern California. All the samples collected had detectable PM10 and endotoxin levels. The geometric mean PM10 was 34.6 microg/m3 [geometric SD (GSD), 2.1; range, 3.0-135]. By volume, the endotoxin geometric mean was 0.44 endotoxin units (EU)/m3 (GSD, 3.1; range, 0.03-5.44). Per unit material collected, the geometric mean of endotoxin collected was 13.6 EU/mg (GSD, 3.2; range, 0.7-96.8). No correlation was found between endotoxin concentrations and other ambient pollutants concurrently measured [ozone, nitrogen dioxide, total acids, or PM2.5 (particulate matter < 2.5 micro m in aerodynamic diameter]. PM10 and endotoxin concentrations were significantly correlated, most strongly in summer. Samples collected in more rural and agricultural areas had lower PM10 and mid-range endotoxin levels. The high desert and mountain communities had lower PM10 levels but endotoxin levels comparable with or higher than the rural agricultural sites. By volume, endotoxin levels were highest at sites downwind of Los Angeles, California, which were also the locations of highest PM10. Endotoxin concentrations measured in this study were all < 5.5 EU/m3, which is lower than recognized thresholds for acute adverse health effects for occupational exposures but in the same range as indoor household concentrations. This study provides the first extensive characterization of endotoxin concentration across a large metropolitan area in relation to PM10 and other pollutant monitoring, and supports the need for studies of the role of endotoxin in childhood asthma in urban settings.</p>

Filtration

Occupational Health and Industrial Hygiene

Air Pollutants

California

Climate

Endotoxins

Particle Size

Seasons

Urbanization

Details

Title: Subtitle: Ambient Endotoxin Concentrations in PM10 from Southern California.
Creators: Linda Mueller-Anneling - University of Iowa
Ed Avol
John M. Peters
Peter S Thorne - University of Iowa
Resource Type: Journal article
Publication Details: Environmental Health Perspectives, Vol.112(5), pp.583-588
DOI: 10.1289/ehp.6552
PMID: 15064165
PMCID: PMC1241925
NLM abbreviation: Environ Health Perspect
ISSN: 0091-6765
Publisher: National Institute of Environmental Health Sciences.
Copyright: EHP is a publication of the U.S. Federal Government, and its content lies in the public domain.
Language: English
Date published: 04/01/2004
Academic Unit: Civil and Environmental Engineering; Occupational and Environmental Health
Record Identifier: 9983557433202771

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