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Federal Register / Vol. 86, No. 27 / Thursday, February 11, 2021 / Notices
TABLE 3NET SUPPLY OF AIM-LISTED HFCS EXCLUDING HFC23 REPORTED TO GHGRP IN YEARS 20112013
Million Metric Tons CO2e Net supplya
Reporting year 2011
2012
2013

Production minus Destruction minus Transformation
Imports 98.416c1

Exports 98.416d1

244
235
288

a Net supply means Production minus Destruction minus Transformation plus Imports minus Exports. Production, Transformation, and Destruction are used as defined in the GHGRP. See 40 CFR 98.416a1, 98.416a3, c8, and 98.416c8, respectively.

TABLE 4IMPORTS OF AIM-LISTED HFCS REPORTED TO GHGRP IN YEARS 20112013
Million Metric Tons CO2e Reporting year
HFC134a
2011
2012
2013

EPA has also reviewed some of the publicly available import and export data that are available for purchase. EPA
is not relying on such sources for this analysis. However, EPA is interested in understanding the extent to which trade data is publicly available. EPA
encourages commenters to provide information concerning any additional publicly available data sources on imports of which they are aware.

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Data Gaps EPA has identified at least two possible data gaps with respect to HFC
imports and exports into the United States for 2011, 2012, and 2013. First, companies that import or export less than 25,000 metric tons CO2e of HFCs annually are not required to report to the GHGRP. Second, there appear to be companies that imported or exported more than 25,000 metric tons CO2e of HFCs annually that have failed to report their imports or exports to the GHGRP.
If these data gaps remain, it could adversely impact EPAs awareness on the amount of historic HFC imports and exports and thus could affect the U.S.
consumption baseline being established in future AIM Act regulatory processes.
EPA specifically encourages submission of data and comments related to how to fill these data gaps and whether there are other gaps that the Agency has not identified.
C. Data Presented Related to Sectors Identified for AIM Act Mandatory Allocations EPA is also seeking comment on documents in the docket related to the applications for which section e4Biv of the AIM Act directs the
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Administrator to allocate the full quantity of allowances necessary, based on projected, current, and historical trends. The docket to this NODA
contains documents presenting data related to the following applications: 1
Propellants in MDIs; 2 defense sprays;
3 structural composite preformed polyurethane foam for marine use and trailer use; 4 the etching of semiconductor material or wafers and the cleaning of CVD chambers within the semiconductor manufacturing sector; and 5 on board aerospace fire suppression. The descriptions below reflect EPAs current understanding of these applications, but EPA intends to further consider how to define these applications in its future proposal under the AIM Act.
MDIs are handheld pressurized inhalation systems that deliver small, precisely measured therapeutic doses of medication directly to the airways of a patient, such as when a patient requires medication to relieve exacerbations of asthma. The pharmaceutical industry historically used CFCs as the propellant for MDIs before introducing HFC 6
propellants, specifically HFC134a and HFC227ea, along with not-in-kind medical treatments.
Defense sprays are aerosol sprays intended for self-defense, including pepper spray and animal deterrent sprays e.g., bear and dog sprays. They contain a chemical irritant and a propellant. Defense sprays utilize four different delivery methods, including streaming, foam, fog, and vapor sprays.
The defense spray industry historically 6 HFC propellants used in MDIs are often referred to as HFAs hydrofluoroalkanes.

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HFC32

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All other AIM-listed HFCs, excluding HFC23

used ozone-depleting substances, such as CFCs, as a propellant before transitioning to HFCs, specifically HFC
134a.
Structural composite preformed polyurethane foam uses a process that fills a precast fabric into shape with expanding foam and provides reinforcement with fibers and resin to make composite materials in building equipment such as boats and on-road trailers. The foam blowing agent used in this process historically was HCFC22
and more recently has been HFC134a.
Semiconductor manufacturers utilize HFCs, primarily HFC23, in two critical processes: To create intricate circuitry patterns on silicon wafers dry etching and to rapidly clean CVD
chambers.
For onboard aerospace fire suppression, EPA is providing information on HFCs used in onboard civil aviation fire suppression systems, including on mainline and regional passenger and freighter aircraft. These systems have historically used ozonedepleting halons, although HFCs, specifically HFC236fa and HFC227ea, are used in lavatory trash receptable systems in new aircraft. EPA encourages comments specifically on other relevant onboard aerospace fire suppression applications that the Agency has not identified.
The reports in the docket describe EPAs current awareness of the use of HFCs and provide information on EPAs current knowledge on projected, current, and historical trends of HFC
related to these statutorily identified applications. EPA requests comment on
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