EPA added HFO-1336mzz-Z to the list of compounds excluded from the definition of "volatile organic compounds" under the CAA due to the compound's negligible contribution to tropospheric ozone formation.

EPA added HFO-1336mzz-Z to the list of compounds excluded from the definition of "volatile organic compounds" under the CAA due to the compound's negligible contribution to tropospheric ozone formation.

EPA added HFO-1336mzz-Z to the list of compounds excluded from the definition of "volatile organic compounds" under the CAA due to the compound's negligible contribution to tropospheric ozone formation.

EPA added HFO-1336mzz-Z to the list of compounds excluded from the definition of "volatile organic compounds" under the CAA due to the compound's negligible contribution to tropospheric ozone formation.

SIP Approval: Alaska (infrastructure requirements for the 1997, 2006, and 2012 fine particulate matter NAAQS).

SIP Approval: Alaska (infrastructure requirements for the 1997, 2006, and 2012 fine particulate matter NAAQS).

SIP Approval: Alaska (infrastructure requirements for the 1997, 2006, and 2012 fine particulate matter NAAQS).

SIP Approval: Alaska (infrastructure requirements for the 1997, 2006, and 2012 fine particulate matter NAAQS).

SIP Approval: Alaska (infrastructure requirements for the 1997, 2006, and 2012 fine particulate matter NAAQS).

SIP Approval: Alaska (infrastructure requirements for the 1997, 2006, and 2012 fine particulate matter NAAQS).