Following the Greenhouse Gas Tailoring Rule, the US EPA issued a proposed two new rules to address the permitting issues which the tailoring rule created.
The GHG Tailoring Rule, specifies that beginning in 2011, facilities that increase GHG emissions substantially will require an air permit.
The EPA proposed two rules to ensure that businesses planning to build new, large facilities or make major expansions to existing ones will be able to obtain Clean Air Act permits that address their greenhouse gas (GHG) emissions.
The Tailoring Rule covers large industrial facilities like power plants and oil refineries that are responsible for 70 percent of the GHGs from stationary sources. The new EPA proposals are a critical component for implementing the Tailoring Rule and would ensure that GHG emissions from these large facilities are minimized.

The Clean Air Act requires states to develop EPA-approved implementation plans that include requirements for issuing air permits. When federal permitting requirements change, as they did after EPA finalized the GHG Tailoring Rule, states likely need to modify these plans.