HB2370 is an emergency measure that extends the deadline for the U.S. Environmental Protection Agency (EPA) to approve proposed modifications to Arizona's gasoline fuel formulation requirements from July 1, 2024, to July 1, 2027. This approval is part of the state implementation plan for air quality. The bill also includes a provision that the director of the Arizona Department of Environmental Quality must notify the director of the Arizona Legislative Council by October 1, 2027, regarding the EPA's approval status. The bill becomes effective immediately upon the Governor's signature if the emergency clause is enacted.