As cities grow, the negative effects of congestion start to play their part, often affecting the cities' ability to become and remain competitive. Although many studies have focused on these negative effects, the links between pollution and city competitiveness are less explored. This paper...

In this paper we study the effect of urban density on the exposure of city dwellers to air pollution using data from the United States urban system. Exploiting geological features to instrument for density, we find an economically and statistically significant pollution-density elasticity of...

With the rapid increase in electronic cigarette (e-cig) users worldwide, secondhand exposure to e-cig aerosols has become a serious public health concern. We summarize the evidence on the effects of e-cigs on indoor air quality, chemical compositions of mainstream and secondhand e-cig aerosols,...