We exploit a unique panel of 75 metro areas ('cities') across the globe and employ a city-fixed effects model to identify the determinants of within-city changes in air pollution concentration between 2005 and 2011. Increasing car and population densities significantly reduce air pollution...

Although the high rate of urbanization and the high incidence of rural poverty are two distinct features of many developing countries, we still do not know the effects of the former on the latter. We address this issue by exploring the mechanisms through which urbanization may alleviate rural...