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LA air toxics, especially PAHs, track preterm birth
In Los Angeles, entire-pregnancy PAHs associated with ~30% higher preterm-birth odds; ammonium nitrate PM2.5 and several traffic markers also raised odds.
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What was preterm prevalence in the study population?
9.2%.
Source: Traffic-related air toxics and preterm birth: a population-based case-control study in Los Angeles County, California · DOI · quote verified
Which pollutants showed ~30% odds increases?
Benzo(g,h,i)perylene and total PAHs; benzo(a)pyrene about 13%.
Source: Traffic-related air toxics and preterm birth: a population-based case-control study in Los Angeles County, California · DOI · quote verified
Why were PAH estimates less precise?
PAHs were measured at only two stations and for shorter times (smallest samples).
Source: Traffic-related air toxics and preterm birth: a population-based case-control study in Los Angeles County, California · DOI · quote verified
What other PM components raised preterm odds per IQR?
Ammonium nitrate PM2.5 plus 9–13% increases for benzene, diesel PM2.5, OC, EC, and biomass-burning PM2.5.
Source: Traffic-related air toxics and preterm birth: a population-based case-control study in Los Angeles County, California · DOI · quote verified
What did authors conclude about PAHs?
PAHs are pollutants of special concern; non-traffic PAH sources also contributed.
Source: Traffic-related air toxics and preterm birth: a population-based case-control study in Los Angeles County, California · DOI · quote verified
How large was the source birth file before exclusions?
n = 276,891 from the California Department of Health.
Source: Traffic-related air toxics and preterm birth: a population-based case-control study in Los Angeles County, California · DOI · quote verified
Who was over-represented near MATES stations?
Younger, Hispanic, Mexico-born, less educated mothers more often on Medi-Cal.
Source: Traffic-related air toxics and preterm birth: a population-based case-control study in Los Angeles County, California · DOI · quote verified
How many exposure information sources were used?
Three different exposure information sources.
Source: Traffic-related air toxics and preterm birth: a population-based case-control study in Los Angeles County, California · DOI · quote verified
What analysis modeled preterm odds?
Single- and multiple-variable conditional logistic regression with IQR ORs.
Source: Traffic-related air toxics and preterm birth: a population-based case-control study in Los Angeles County, California · DOI · quote verified
Did ammonium nitrate suggest a role beyond primary traffic?
Yes—the secondary PM2.5 component suggested secondary pollutants also matter.
Source: Traffic-related air toxics and preterm birth: a population-based case-control study in Los Angeles County, California · DOI · quote verified