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 …

China's environmental regulators have sought to reduce the Yangtze River's water pollution. We document that this …, the regulation has focused on reducing one dimension of water pollution called chemical oxygen demand (COD). Thus, local …

Using the most comprehensive data file ever compiled on air pollution, water pollution, environmental regulations, and … air pollution regulations were effective at reducing ambient concentrations of particulate matter, sulfur dioxide, and … nitrogen dioxide. The most successful air pollution regulation is associated with a modest and statistically insignificant …

facilities before and after CWA grant receipt. Pollution only decreased downstream from facilities required to upgrade their …

, and polls for decades have listed water pollution as Americans' number one environmental concern. We assess the history … pollution has fallen since these laws, in part due to their interventions. Second, investments made under these laws could be … more cost-effective. Third, most recent studies estimate benefits of cleaning up pollution in rivers and lakes which are …

We study the relationship between water nutrient pollution and U.S. agriculture using data between the early 1970s and …