We examine the impact of air pollution on infant death in California over the 1990s. Our work offers several innovations: First, many previous studies examine populations subject to far greater levels of pollution. In contrast, the experience of California in the 1990s is clearly relevant to current debates over the regulation of pollution. Second, many studies examine a few routinely monitored pollutants in isolation, generally because of data limitations. We examine four criteria pollutants in a common framework. Third, we develop an identification strategy based on within zip code variation in pollution levels that controls for potentially important unobserved characteristics of high pollution areas. Fourth, we use rich individual-level data to investigate effects of pollution on infant mortality, fetal deaths, low birth weight and prematurity in a common framework. We find that the reductions in carbon monoxide (CO) and particulates (PM10) over the 1990s in California saved over 1,000 infant lives. However, we find little consistent evidence of pollution effects on fetal deaths, low birth weight or short gestation.

In the 1980s and 1990s many states adopted tort reforms. It has been argued that these reforms have reduced the practice of defensive medicine arising from excess tort liability. We find that this does not appear to be true for a large and important class of cases—childbirth in the United States. Using data from national vital statistics natality files on millions of individual births from 1989 to 2001, we ask whether specific tort reforms affect the types of procedures that are performed, and the health outcomes of mothers and their infants. We find that reform of the Joint and Several Liability rule (or the “deep pockets rule”) reduces complications of labor and procedure use, whereas caps on noneconomic damages increase them. We show that these results are consistent with a model of tort reform that explicitly allows for variations in patient condition.