Forests accompany the cities we build. There are an estimated 5.5 billion urban trees in the United States. Globally, about 25 percent of urban land is covered by tree canopy. This study examines urban forests as a policy tool for air pollution mitigation. We study an afforestation program in...

We identify the contemporaneous effects of PM2.5 concentrations on medical costs in Beijing by analyzing datasets that combine daily air quality indexes over a four-year period with detailed records of all hospital visits and medical transactions of beneficiaries of a government medical...

This study estimates causal effects of traffic congestion on air quality in local areas within a city, highlighting spatial variations in local traffic, local air pollution, and health risks to residents due to local pollutant exposure. We employ a large size taxi driving trajectory data to...