States and EPA have a long history of implementing the good neighbor provision, including developing and implementing regulations that preceded the current Cross-State Air Pollution Rule (CSAPR) programs.  These programs achieved important emission reductions and air quality improvements to help states meet older National Ambient Air Quality Standards (NAAQS).  These historical programs also helped shape the current CSAPR programs.

• Clean Air Interstate Rule ( 2009 - 2014) (Search EPA’s Archive for this document)
• NOx Budget Trading Program ( 2003 - 2009)
• Ozone Transport Commission (OTC) NOx Budget Program (1999-2002)