Science Advances

Supplementary Materials

This PDF file includes:

  • Supplementary Text
  • Fig. S1. Unconditional trends in maximum daily 8-hour pollution and days with maximum daily 8-hour pollution exceeding 70 ppb in large metro areas and national parks.
  • Fig. S2. Nonlinear impacts of ozone and weather on visitation.
  • Fig. S3. Seasonal trends in control and outcome variables.
  • Fig. S4. Estimated impact of exceedance days by AQI category on log visitation from 1990 to 2014.
  • Table S1. Pollution monitors, visitation, upwind ozone, and weather data by national park and year.
  • Table S2. Top 20 U.S. cities.
  • Table S3. Estimated impact of monthly average maximum ozone concentrations (ppb) in national parks on log visitation from 1990 to 2014 (additional specifications).
  • Table S4. Estimated impact of monthly average maximum ozone concentrations (ppb) in national parks on log visitation from 1990 to 2014 (robustness checks).
  • Table S5. Estimated impact of alternative monthly average pollution levels in national parks on log visitation from 1990 to 2014.

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