This article proposes and evaluates four hypotheses about US pollution and environmental policy over the last half … century. First, air and water pollution have declined substantially, although greenhouse gas emissions have not. Second …, environmental policy explains a large share of these trends. Third, much of the regulation of air and drinking water pollution has …

on establishment-level pollution emissions and business characteristics - including trade activities and global … trade policy uncertainty. Emission abatement is mainly driven by a decline in pollution emission intensity, and not by … pollution haven hypothesis whereby offshoring is central to the mechanism - US manufacturers begin to source from abroad and …