Violations Good Neighbor Provision Regulatory Authority Regulatory Waivers Emissions Testing Violation Supreme Court Cases EPA Regulations Permit Violations Emissions Standards California Regulations Vehicle Emissions Standards Legal Challenges Pollutants Regulatory Framework Endangerment Finding Water Quality Regulations Waivers Settlements Compliance Interstate Pollution Rules Emissions Defeat Devices Emissions Violations Penalty Civil Penalty Settlement Ozone Regulation Power Plant Emissions Regulatory Compliance Power Plant Standards Greenhouse Gas Emissions Administrative Procedure Act Supreme Court Decisions Enforcement