The
California Air Resources Board, also known as
CARB or
ARB, is the "clean air agency" in the
government of California. Established in 1967 when then-governor
Ronald Reagan signed the Mulford-Carrell Act, combining the Bureau of Air Sanitation and the Motor Vehicle Pollution Control Board, CARB is a department within the
cabinet-level
California Environmental Protection Agency. California is the only state that is permitted to have such a regulatory agency, since it is the only state that had one before the passage of the federal
Clean Air Act. Other states are permitted to follow CARB standards, or use the federal ones, but not set their own.