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Air quality, infant mortality, and the Clean Air Act of 1970

Research and Teaching Output of the MIT Community

Show simple item record Chay, Kenneth Y. en_US Greenstone, Michael en_US
dc.contributor.other Massachusetts Institute of Technology. Center for Energy and Environmental Policy Research. en_US 2009-04-03T17:06:00Z 2009-04-03T17:06:00Z 2003 en_US
dc.identifier 2004-006 en_US
dc.description.abstract We examine the effects of total suspended particulates (TSPs) air pollution on infant health using the air quality improvements induced by the 1970 Clean Air Act Amendments (CAAA). This legislation imposed strict regulations on industrial polluters in "nonattainment" counties with TSPs concentrations exceeding the federal ceiling. We use nonattainment status as an instrumental variable for TSPs changes to estimate their impact on infant mortality changes in the first year that the 1970 CAAA was in force. TSPs nonattainment status is associated with sharp reductions in both TSPs pollution and infant mortality from 1971 to 1972. The greater reductions in nonattainment counties near the federal ceiling relative to the ₃attainment₄ counties narrowly below the ceiling suggest that the regulations are the cause. We estimate that a one percent decline in TSPs results in a 0.5 percent decline in the infant mortality rate. Most of these effects are driven by a reduction in deaths occurring within one month of birth, suggesting that fetal exposure is a potential biological pathway. The results imply that roughly 1,300 fewer infants died in 1972 than would have in the absence of the Clean Air Act. en_US
dc.format.extent 43, [17] p en_US
dc.publisher MIT Center for Energy and Environmental Policy Research en_US
dc.relation.ispartofseries MIT-CEEPR (Series) ; 04-006WP. en_US
dc.title Air quality, infant mortality, and the Clean Air Act of 1970 en_US
dc.type Working Paper en_US
dc.identifier.oclc 58725052 en_US

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