SIP Approval: Indiana (revisions regarding nitrogen oxides SIP call and Clean Air Interstate Rule trading program).

SIP Proposal: Ohio (revisions regarding nitrogen oxides SIP call and alternative monitoring requirements for certain covered sources). 

SIP Approval: Ohio (revisions regarding nitrogen oxides SIP call and Clean Air Interstate Rule).

SIP Proposal: Ohio (revisions to nitrogen oxides SIP call and trading program requirements).

EPA revised nitrogen oxides emissions monitoring requirements that states must include in SIPs for certain emissions sources.

SIP Approval: Tennessee (revisions to nitrogen oxides SIP call and trading program requirements).

SIP Proposal: Tennessee (revisions to nitrogen oxides SIP call and trading program requirements).