NOx State Implementation Plan (SIP) (SIP)

Building upon analyses done by the Ozone Transport Assessment Group (OTAG), this rule was finalized by the Environmental Protection Agency (EPA) in 1998. It required states significantly contributing to ozone non-attainment problems in other states to reduce their NOx emissions during the ozone season beginning in 2003. This rule gave states the flexibility to reduce emissions through various means and gave them the option to participate in the NOx Budget Trading Program.