Fig. 2.
Structure of potential outcomes for different regulation programs under the AGIA. Points represent monitor locations in counties contained in portions of California and Arizona. (a) A = aobs. The observed regulation program determines 𝒰aobs and ℛaobs. All pollution and mortality outcomes are observed under this program. (b) A = 0. Pollution and mortality outcomes are observed for locations in 𝒰aobs and unobserved for those in ℛaobs. (c) A = 1. Pollution and mortality outcomes are observed for locations in ℛaobs and unobserved for those in 𝒰aobs.