Highlights
- • PTB was significantly associated with traffic air pollutant NO2 exposure during pregnancy.
- • The effect of NO2 exposure in the conception month and 1st trimester was more important.
- • Indoor mold/damp stains in pregnancy was also related with an increased risk of PTB.
- • There is a significant interaction between outdoor NO2 and indoor mold/damp stains on PTB.
- • Sensitive populations were more susceptible to the PTB risk of outdoor and indoor air pollution.
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