U.S. EPA has announced that stationary sources will not be required to get permits under the Clean Air Act (CAA) for greenhouse gases (GHGs) until at least January 2011. "Today’s action determines that Clean Air Act construction and operating permit requirements for the largest emitting facilities will begin when the first national rule controlling GHGs takes effect. If finalized as proposed, the rule limiting GHG emissions for cars and light trucks would trigger these requirements in January 2011 – the earliest model year 2012 vehicles meeting the standards can be sold in the United States. The agency expects to issue final vehicle GHG standards shortly."