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Traffic-related air toxics and preterm birth: a population-based case-control study in Los Angeles County, California.
Environ Health. 2011 Oct 07; 10:89.EH

Abstract

BACKGROUND

Numerous studies have associated air pollutant exposures with adverse birth outcomes, but there is still relatively little information to attribute effects to specific emission sources or air toxics. We used three exposure data sources to examine risks of preterm birth in Los Angeles women when exposed to high levels of traffic-related air pollutants--including specific toxics--during pregnancy.

METHODS

We identified births during 6/1/04-3/31/06 to women residing within five miles of a Southern California Air Quality Management District (SCAQMD) Multiple Air Toxics Exposure Study (MATES III) monitoring station. We identified preterm cases and, using a risk set approach, matched cases to controls based on gestational age at birth. Pregnancy period exposure averages were estimated for a number of air toxics including polycyclic aromatic hydrocarbons (PAHs), source-specific PM2.5 (fine particulates with aerodynamic diameter less than 2.5 μm) based on a Chemical Mass Balance model, criteria air pollutants based on government monitoring data, and land use regression (LUR) estimates of nitric oxide (NO), nitrogen dioxide (NO2) and nitrogen oxides (NOx). Associations between these metrics and odds of preterm birth were estimated using conditional logistic regression.

RESULTS

Odds of preterm birth increased 6-21% per inter-quartile range increase in entire pregnancy exposures to organic carbon (OC), elemental carbon (EC), benzene, and diesel, biomass burning and ammonium nitrate PM2.5, and 30% per inter-quartile increase in PAHs; these pollutants were positively correlated and clustered together in a factor analysis. Associations with LUR exposure metrics were weaker (3-4% per inter-quartile range increase).

CONCLUSIONS

These latest analyses provide additional evidence of traffic-related air pollution's impact on preterm birth for women living in Southern California and indicate PAHs as a pollutant of concern that should be a focus of future studies. Other PAH sources besides traffic were also associated with higher odds of preterm birth, as was ammonium nitrate PM2.5, the latter suggesting potential importance of secondary pollutants. Future studies should focus on accurate modeling of both local and regional spatial and temporal distributions, and incorporation of source information.

Authors+Show Affiliations

Department of Epidemiology, School of Public Health, University of California, Los Angeles, CA, USA. mwilhelm@ucla.eduNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21981989

Citation

Wilhelm, Michelle, et al. "Traffic-related Air Toxics and Preterm Birth: a Population-based Case-control Study in Los Angeles County, California." Environmental Health : a Global Access Science Source, vol. 10, 2011, p. 89.
Wilhelm M, Ghosh JK, Su J, et al. Traffic-related air toxics and preterm birth: a population-based case-control study in Los Angeles County, California. Environ Health. 2011;10:89.
Wilhelm, M., Ghosh, J. K., Su, J., Cockburn, M., Jerrett, M., & Ritz, B. (2011). Traffic-related air toxics and preterm birth: a population-based case-control study in Los Angeles County, California. Environmental Health : a Global Access Science Source, 10, 89. https://doi.org/10.1186/1476-069X-10-89
Wilhelm M, et al. Traffic-related Air Toxics and Preterm Birth: a Population-based Case-control Study in Los Angeles County, California. Environ Health. 2011 Oct 7;10:89. PubMed PMID: 21981989.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Traffic-related air toxics and preterm birth: a population-based case-control study in Los Angeles County, California. AU - Wilhelm,Michelle, AU - Ghosh,Jo Kay, AU - Su,Jason, AU - Cockburn,Myles, AU - Jerrett,Michael, AU - Ritz,Beate, Y1 - 2011/10/07/ PY - 2011/01/19/received PY - 2011/10/07/accepted PY - 2011/10/11/entrez PY - 2011/10/11/pubmed PY - 2012/2/3/medline SP - 89 EP - 89 JF - Environmental health : a global access science source JO - Environ Health VL - 10 N2 - BACKGROUND: Numerous studies have associated air pollutant exposures with adverse birth outcomes, but there is still relatively little information to attribute effects to specific emission sources or air toxics. We used three exposure data sources to examine risks of preterm birth in Los Angeles women when exposed to high levels of traffic-related air pollutants--including specific toxics--during pregnancy. METHODS: We identified births during 6/1/04-3/31/06 to women residing within five miles of a Southern California Air Quality Management District (SCAQMD) Multiple Air Toxics Exposure Study (MATES III) monitoring station. We identified preterm cases and, using a risk set approach, matched cases to controls based on gestational age at birth. Pregnancy period exposure averages were estimated for a number of air toxics including polycyclic aromatic hydrocarbons (PAHs), source-specific PM2.5 (fine particulates with aerodynamic diameter less than 2.5 μm) based on a Chemical Mass Balance model, criteria air pollutants based on government monitoring data, and land use regression (LUR) estimates of nitric oxide (NO), nitrogen dioxide (NO2) and nitrogen oxides (NOx). Associations between these metrics and odds of preterm birth were estimated using conditional logistic regression. RESULTS: Odds of preterm birth increased 6-21% per inter-quartile range increase in entire pregnancy exposures to organic carbon (OC), elemental carbon (EC), benzene, and diesel, biomass burning and ammonium nitrate PM2.5, and 30% per inter-quartile increase in PAHs; these pollutants were positively correlated and clustered together in a factor analysis. Associations with LUR exposure metrics were weaker (3-4% per inter-quartile range increase). CONCLUSIONS: These latest analyses provide additional evidence of traffic-related air pollution's impact on preterm birth for women living in Southern California and indicate PAHs as a pollutant of concern that should be a focus of future studies. Other PAH sources besides traffic were also associated with higher odds of preterm birth, as was ammonium nitrate PM2.5, the latter suggesting potential importance of secondary pollutants. Future studies should focus on accurate modeling of both local and regional spatial and temporal distributions, and incorporation of source information. SN - 1476-069X UR - https://www.unboundmedicine.com/medline/citation/21981989/Traffic_related_air_toxics_and_preterm_birth:_a_population_based_case_control_study_in_Los_Angeles_County_California_ L2 - https://ehjournal.biomedcentral.com/articles/10.1186/1476-069X-10-89 DB - PRIME DP - Unbound Medicine ER -