Air Pollution Increases Influenza Hospitalizations

Gregor Singer; Joshua Graff Zivin; Matthew Neidell; Nicholas Sanders

In Column (2) of Table S .5, we drop weather controls, and in Column (3) we include alternative functional forms of the weather controls using second order polynomials in temperature and humidity with a full set of interactions. In Columns (4) and (5) we include county-by-influenza season (Oct -Mar) fixed effects and state-by-month of the year fixed effects. Columns (6) and (7) replicate (1) and (4), but cluster standard errors on the county level as well as on the state-by-year level to allow additional arbitrary spatial correlation of errors across counties within a state-year. Table S.6 reports from further robustness checks. Column (1) replicates the baseline results. Column (2) does not winsorize the AQI data. Column (3) drops county-month cells with missing AQI 6 All rights reserved. No reuse allowed without permission. author/funder, who has granted medRxiv a license to display the preprint in perpetuity.