The Division of Air Quality is committed to openness and transparency as it updates and amends state Air Quality Regulations and related state implementation plans. This page provides information on items under development.
Division of Air Quality
The Division of Air Quality is developing regulations for the use and manufacturing of Hydrofluorocarbons (HFCs), as directed by Governor John Carney and supported by House Concurrent Resolution 60, passed by the Delaware General Assembly on June 30, 2019.
A Public Hearing was held on April 23, 2020.
Hydrofluorocarbons (HFCs) are used as replacements for ozone-depleting substances in air-conditioning, refrigeration, foam-blowing, solvents, and aerosols. Emissions of HFCs are growing at a rate of eight percent per year. This regulation will address the critical need to phase down the use of HFCs, which are high global warming potential (GWP) gases that are hundreds to thousands of times more potent than carbon dioxide (CO2) in contributing to climate change per unit of mass.
A court ruling has limited the U.S. EPA’s ability to require replacement of HFCs under the Significant New Alternatives Policy (SNAP) rules. Although legal actions have been initiated to defend the SNAP rules in court, state action is required to maintain the HFC prohibitions schedule, in line with the vacated SNAP rules.
Refrigerants with lower global warming potential are available at equivalent cost. They are commonly used in stationary refrigeration and air-conditioning equipment. The industry was already working to comply with EPA replacement regulations and generally supports uniform nationwide rules.
This regulation development process started with DNREC Start Action Notice 2019-08.
Note: The final regulation titled Prohibitions on Use of Certain Hydrofluorocarbons in Specific End-Uses, has been published in the March 1, 2021 Delaware Register of Regulations, and will be effective March 11, 2021. Please note that the earliest effective date of the end-use specific prohibition schedule is September 1, 2021.
Solvent cleaning is the process of using solvents to remove contaminants from various plastic, metal or other substrates (surfaces). The following businesses may use solvent cleaning and drying in their operations: vehicle sales and servicing locations; machine shops; and manufacturers and servicers of electronic, pharmaceutical, aerospace, and other mobile equipment.
The objective of these amendments is to adopt certain provisions from the Ozone Transport Commission 2012 model rule for solvent degreasing. These amendments will reduce emissions of volatile organic compounds from solvent cleaning operations.
This regulatory amendment process started with DNREC Start Action Notice 2019-05.