The Changing Nature of Pollution, Income, and Environmental Inequality in the United States

This paper uses tax records linked to administrative Census data and high-resolution measures of air pollution exposure (PM2.5) to study the evolution of the Black-White pollution exposure gap since 1984. We decompose changes in the racial exposure gap into (i) rank-preserving compression of the pollution distribution and (ii) changes stemming from a reordering of Black and White households within the pollution distribution. We find a narrowing of the racial exposure gap that is overwhelmingly driven by rank-preserving changes rather than positional changes. Recently, however, the relative positions of Black and White households in the upper tail of the pollution distribution have converged.