The impacts of air pollution on low birth weight

This study examines the impacts of air pollution on low birth weight by considering overtime variation in Korea in early 2000, when some parts of Korea experienced huge drop in air pollution due to regulation. The mother's exposure to ozone level above 0.12 ppm per hour during the first trimester increased the probability of low birth weight by 0.4 percentage point (0.08% of the sample mean). Exposure to carbon monoxide or sulphur dioxide (SO 2 ) during the third trimester also led to a significant but modest increase in the probability of low birth weight.