EPA is proposing to approve California’s air quality standards for perchloroethylene (PERC) at dry cleaning facilities throughout the state. 75 Fed. Reg. 61,662 (10/6/10). California’s Air Resources Board (ARB) adopted the standards in 2007 to prohibit the use of PERC in dry cleaning and water repellant solutions by 2023. It also barred new dry cleaners from purchasing equipment that uses PERC beginning in 2008 and required that machines 15 years or older be removed. Beginning in 2010, the ARB requires dry cleaners located beneath or adjacent to apartment buildings or homes to eliminate use of the chemical. The state agency must obtain EPA’s approval to substitute its rule for EPA’s 2006 National Emission Standards for Hazardous Air Pollutants (NSHAPs) for dry cleaners. EPA and ARB will accept comments on the proposed approval until November 5, 2010.