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Ground-level Ozone Pollution

Ozone Volatile Organic Compound (VOC) Exemptions Rules

Revision to the Regulatory Definition of Volatile Organic Compounds – Exclusion of cis-1,1,1,4,4,4-hexafluorobut-2-ene (HFO-1336mzz-Z)

November 16, 2018 - EPA added HFO-1336mzz-Z to the list of compounds excluded from the regulatory definition of volatile organic compounds or VOC. Some VOC contribute significantly to the formation of ground-level ozone which can cause serious respiratory illnesses. Evidence shows that HFO 1336mzz-Z is negligibly reactive in forming ground-level ozone. This action will allow states to remove regulatory controls on HFO-1336mzz-Z that are part of State Implementation Plans designed to help meet the ground-level ozone standards. HFO-1336mzz-Z is used in a variety of applications as a replacement for foam expansion or blowing agents. Learn More

Direct Final Rule to Revise Definition of Volatile Organic Compound Requirements for HFE-347pcf2

July 20, 2016 - EPA issued direct final revisions to the regulatory definition of volatile organic compounds (VOC) under the Clean Air Act.   This action adds 1,1,2,2-Tetrafluoro-1-(2,2,2-trifluoroethoxy) ethane (also known as HFE-347pcf2; CAS number 406-78-0) to the list of compounds excluded from the regulatory definition of VOC because it makes a negligible contribution to ground-level ozone formation.  Learn More

Proposal to Revise Definition of Volatile Organic Compound Requirements for t-Butyl Acetate

February 5, 2015 - EPA proposed to remove remaining Clean Air Act volatile organic compound (VOC) requirements for t-Butyl Acetate (TBAC). Learn More

Rule to Exclude 2-Amino-2-Methyl-1-Propanol from Control as a Volatile Organic Compound

March 27, 2014 - EPA issued a direct final rule with a parallel proposal identifying 2-Amino-2-methyl-1-propanol (also known as AMP) as a chemical compound that will no longer be regulated as a VOC under the Clean Air Act. This will remove AMP from regulatory requirements related to controlling VOC emissions in order to meet the national ambient air quality standards (NAAQS) for ozone. Learn More

Group of Four Hydrofluoropolyethers (HFPEs) No Longer Regulated as a Volatile Organic Compound

February 12, 2013 - EPA issued a final rule that excludes of a group of four Hydrofluoropolyethers (HFPEs) from regulation as a VOC under the Clean Air Act. This will remove the HFPEs from the control requirements in order to meet the ozone NAAQS. Learn More

2,3,3,3-tetrafluoropropene No Longer Regulated as a Volatile Organic Compound

October 22, 2013 - The Environmental Protection Agency has issued a final rule that identified 2,3,3,3-tetrafluoropropene (also known as HFO-1234yf) as a chemical compound that will no longer be regulated as a VOC under the Clean Air Act. This will remove it from regulatory requirements related to controlling VOC emissions in order to meet the ozone NAAQS. EPA will add HFO-1234yf to the list of negligibly reactive compounds in EPA’s regulatory definition of VOC. Learn More