The Wildfire Emissions Prevention Act of 2026 aims to amend the Clean Air Act to address air quality monitoring data influenced by exceptional events, particularly in the context of wildfires. It introduces definitions related to exceptional events and prescribed fires and requires the Administrator to revise regulations to accommodate these definitions. Additionally, the bill establishes a Smoke Ready Communities Program, allowing the Administrator of the Environmental Protection Agency to provide competitive grants to eligible entities for assessing, preventing, controlling, or abating wildfire smoke hazards in community buildings. Furthermore, it outlines the eligible entities and cost-sharing provisions for the grants.