Air Quality and Asthma Hospitalization Rates: Evidence of $PM_{2.5}$ Concentrations in Pennsylvania Counties

Erfanian, Elham, and Alan R. Collins. 2020. “Air Quality and Asthma Hospitalization Rates: Evidence of <span Class="embedded-Math" Style="white-Space: Nowrap;">$PM_{2.5}$</span> Concentrations in Pennsylvania Counties.” Journal of Regional Analysis & Policy 50 (1): 1–15.