2.9 - Quick Reference
Module: Environmental Effects and Federal Regulations
Covers: Sections 2.1–2.8
Regulatory verification date: August 6, 2026
Use: Rapid review before the Module 2 practice questions and later Core/Universal certification review
1. Ozone and Ultraviolet Radiation
Ozone Location
| Item | Quick Reference |
|---|---|
| Ozone formula | |
| Ground-level ozone | Harmful air pollutant; associated with smog and adverse effects on lungs and vegetation |
| Stratospheric ozone | Protective ozone layer |
| Approximate ozone-layer region used in this module | 15–40 km above Earth’s surface |
| Main environmental function | Absorbs much of the Sun’s harmful ultraviolet radiation |
Ultraviolet Radiation
| UV Band | Ozone-Layer Relationship |
|---|---|
| UVA | Weakly absorbed; much reaches Earth’s surface |
| UVB | Mostly absorbed by ozone; some reaches the surface |
| UVC | Absorbed by atmospheric oxygen and ozone; does not normally reach Earth’s surface |
Less stratospheric ozone → more UVB reaching Earth’s surface.
Increased UVB can affect:
- Human health.
- Plants.
- Aquatic ecosystems.
- Biogeochemical cycles.
- Outdoor materials.
2. Ozone-Depletion Process
Source-to-Effect Sequence
CFC or HCFC released near Earth's surface
→ survives long enough for atmospheric transport
→ reaches the stratosphere
→ strong UV radiation breaks the molecule apart
→ reactive chlorine is released
→ chlorine participates in catalytic ozone destruction
→ chlorine is regenerated and can repeat the cycle
CFCs and HCFCs do not reach the stratosphere because they are “lighter than air.” Atmospheric circulation transports long-lived compounds through the atmosphere.
Simplified Chlorine Cycle
Net:
High-Priority Chemistry Points
- Chlorine acts as a catalyst and is regenerated.
- One reactive chlorine atom can participate in many ozone-destruction cycles.
- ClO• is an intermediate in the simplified cycle.
- Bromine participates in similar and coupled ozone-destruction chemistry.
- HCFCs still contain chlorine and have nonzero ODP.
- HCFCs generally have lower ODP than CFCs because they are more reactive in the lower atmosphere and are less likely to reach the stratosphere intact.
- Polar stratospheric conditions can accelerate ozone destruction.
3. ODP and GWP
| Term | Reference | Meaning |
|---|---|---|
| ODP — Ozone-Depletion Potential | CFC-11 = 1.0 | Relative ability of a substance to deplete stratospheric ozone |
| GWP — Global-Warming Potential | CO₂ = 1 | Relative climate effect over a stated time horizon |
Critical Distinctions
- Zero ODP does not mean zero GWP.
- Low GWP does not mean no safety hazard.
- GWP must be associated with a source, assessment, and time horizon.
- Refrigerant family does not by itself establish safety, SNAP acceptability, equipment compatibility, or retrofit suitability.
4. Refrigerant-Family Table
| Family / Refrigerant | Composition or Identity | ODP Pattern | GWP / Environmental Reminder |
|---|---|---|---|
| CFC | Carbon + chlorine + fluorine | Significant | Often high GWP |
| HCFC | Hydrogen + carbon + chlorine + fluorine | Lower than CFC but not zero | Varies |
| HFC | Hydrogen + fluorine + carbon; no chlorine | 0 | Can still have significant GWP |
| HFO | Hydrogen + fluorine + carbon with C=C double bond | 0 | Generally low GWP |
| Hydrocarbon | Hydrogen + carbon | 0 | Very low GWP; flammability is important |
| R-744 | Carbon dioxide, CO₂ | 0 | GWP 1 by definition; high-pressure and exposure concerns remain |
| R-717 | Ammonia, NH₃ | 0 | Very low direct climate impact; toxicity is important |
| R-718 | Water, H₂O | 0 | GWP 0 under the EPA refrigerant-table convention; specialized applications |
Representative Values Used in Section 2.3
| Refrigerant | Family | ODP | Representative 100-Year GWP |
|---|---|---|---|
| CFC-11 | CFC | 1.0 | 4,750 |
| CFC-12 | CFC | 1.0 | 10,900 |
| HCFC-22 | HCFC | 0.055 | 1,810 |
| HCFC-123 | HCFC | 0.02 | 77 |
| HFC-134a | HFC | 0 | 1,430 |
| HFC-32 | HFC | 0 | 675 |
| R-410A | HFC blend | 0 | 2,088 |
| HFO-1234yf | HFO | 0 | 1 |
| HFO-1234ze(E) | HFO | 0 | 1 |
| R-290 | Hydrocarbon | 0 | 3.3 |
| R-600a | Hydrocarbon | 0 | 1 |
| R-717 | Ammonia | 0 | 1 |
| R-744 | Carbon dioxide | 0 | 1 |
| R-718 | Water | 0 | 0 |
These values use the source bases identified in Section 2.3. Do not compare GWP numbers from different assessments without checking the basis.
5. Clean Air Act and Montreal Protocol
Regulatory Relationship
| Item | Quick Reference |
|---|---|
| Montreal Protocol | International agreement for control and phaseout of ozone-depleting substances |
| Clean Air Act Title VI | U.S. statutory framework for stratospheric-ozone protection |
| Section 608 | Stationary refrigeration and air-conditioning refrigerant management |
| Section 609 | Motor-vehicle air-conditioning servicing requirements |
| Class I substances | Includes CFCs and other high-priority ozone-depleting substances |
| Class II substances | HCFCs |
High-Priority Dates
| Date | Event |
|---|---|
| 1987 | Montreal Protocol adopted |
| 1989 | Montreal Protocol entered into force |
| 1990 | Clean Air Act amendments added the modern Title VI ozone-protection framework |
| 1994 | U.S. production/import ban for halons, subject to authorized exceptions |
| 1996 | U.S. production/import phaseout of CFCs and most other Class I ODS, subject to authorized exceptions |
| 2003 | No U.S. production/import of HCFC-141b |
| 2010 | HCFC-22 and HCFC-142b production/import restricted to servicing equipment manufactured before 2010 |
| 2015 | Additional HCFC production/import restrictions |
| 2016 | Kigali Amendment adopted; addresses HFC phasedown for climate protection |
| 2020 | U.S. production/import of HCFC-22 and HCFC-142b ended |
| 2030 | U.S. production/import of all remaining HCFCs scheduled to end |
Phaseout Does Not Mean Automatic Equipment Ban
The 2020 R-22 milestone means production and import of HCFC-22 ended. It does not mean:
- Every R-22 appliance became illegal.
- Existing R-22 equipment had to be replaced immediately.
- Recovered or reclaimed R-22 became illegal.
- Section 608 service requirements ended.
Existing equipment may continue to use legally available previously produced, recovered, recycled, or reclaimed refrigerant where permitted.
6. Venting Prohibition
Current Rule
Section 608 prohibits knowingly venting covered refrigerant during:
- Maintenance.
- Service.
- Repair.
- Disposal.
The prohibition applies to:
- Class I ozone-depleting refrigerants.
- Class II ozone-depleting refrigerants.
- Non-exempt substitute refrigerants, including common HFCs.
Three Broad Categories of Permitted Releases
| Category | Quick Reference |
|---|---|
| De minimis release | Incidental to a good-faith recovery, recycling, or safe-disposal attempt using the required practices and suitable equipment |
| Normal-operation emission | Emission occurring during normal equipment operation rather than service, repair, maintenance, or disposal; separate requirements may still apply |
| EPA-exempt substitute | Release of a substitute that EPA has specifically exempted in the applicable end use |
De Minimis
- Not a fixed quantity selected by the technician.
- Small hose connection or disconnection losses can qualify when incidental to compliant work.
- Residual refrigerant after compliant recovery can qualify.
- The technician must minimize releases.
Nitrogen
| Situation | Correct Response |
|---|---|
| Nitrogen only | Nitrogen is exempt from the Section 608 venting prohibition |
| Nitrogen mixed with Class I, Class II, or non-exempt substitute refrigerant | Recover the mixture; do not vent |
Nitrogen does not make a covered refrigerant exempt.
Broad Exemption Reminder
Section 2.5 identifies:
- CO₂ — exempt in any application.
- Nitrogen — exempt in any application.
- Water — exempt in any application.
- Certain ammonia and hydrocarbon exemptions — end-use specific.
Do not generalize an end-use-specific exemption to every application.
7. Refrigerant Sales Restrictions
Current Rule
The sales restriction covers:
- Class I refrigerants.
- Class II refrigerants.
- Non-exempt substitute refrigerants.
The restriction was extended to non-exempt substitutes beginning January 1, 2018.
Purchase Authority
| Purchaser / Situation | Quick Reference |
|---|---|
| Section 608 certified technician | May purchase covered refrigerant for the stationary-equipment scope of the certification |
| Section 609 certified technician | May purchase refrigerant acceptable for MVAC use |
| Section 609 technician buying stationary refrigerant | Not authorized by Section 609 certification alone |
| Employer of a certified technician | Purchase may be allowed with proof of current certified employment |
| Authorized representative | May complete a transaction for a qualifying purchaser |
| Lawful reseller | Conditional pathway; seller must verify the resale basis |
| Appliance manufacturer | Allowed purchase pathway subject to other applicable requirements |
| Complete factory-charged appliance/component | Purchaser certification is generally not required for the equipment purchase |
Small-Can MVAC Exception
Certification is not required for the purchase only when all applicable conditions are satisfied:
- Non-exempt substitute refrigerant.
- Intended for MVAC use.
- Container designed to hold 2 lb or less.
- Required unique fitting.
- Compliant self-sealing valve.
The exception does not apply to:
- Stationary-equipment refrigerant.
- CFC-12.
- Paid MVAC service by an uncertified person.
- Intentional venting.
Seller Records
Required sales records include:
- Purchaser name.
- Date of sale.
- Quantity purchased.
- Employment documentation when applicable.
Retention period: 3 years.
Online and delivered sales follow the same federal restriction.
Used Refrigerant
- Used refrigerant generally must be reclaimed by an EPA-certified reclaimer before sale to a new owner for use as refrigerant.
- Same-owner reuse is different from sale to a new owner.
8. Recordkeeping and Enforcement
Technician Records
| Record | Quick Reference |
|---|---|
| Section 608 certificate | Keep at the place of business and retain until 3 years after no longer operating as a technician |
| Disposal record — appliance with more than 5 lb and less than 50 lb | Keep the required recovery/transfer information for 3 years |
Refrigerant Retailer Records
- Purchaser name.
- Sale date.
- Quantity.
- Certification or employment documentation when applicable.
- General retention period: 3 years.
Applicable Large ODS Appliance Records
For current Section 608 leak-repair provisions, qualifying appliances contain 50 lb or more of Class I or Class II refrigerant.
Owner/operator records can include:
- Full charge.
- Service events.
- Refrigerant additions and removals.
- Leak inspections.
- Initial and follow-up verification tests.
- Retrofit or retirement information where applicable.
Chronically Leaking Appliance Report
For an applicable Section 608 appliance:
- 125% or more of full charge leaked in a calendar year → EPA report required.
- Report due March 1 of the following year.
Certification and Record Integrity
Do not:
- Lend or borrow a certification card.
- Use a former employee’s certification after the qualifying employment ends.
- Alter a certification.
- Record recovery that did not occur.
- Invent refrigerant quantities.
- Backdate required records.
- Sign for work not performed or verified.
9. Current Versus Historical Leak-Repair Rules
Section 608
| Appliance Category | Historical Section 608 Trigger | Current Section 608 Trigger |
|---|---|---|
| Industrial process refrigeration | 35% | 30% |
| Commercial refrigeration | 35% | 20% |
| Comfort cooling | 15% | 10% |
| Other qualifying appliances | Legacy materials vary | 10% |
Current Section 608 applicability:
- Full charge: 50 lb or more.
- Refrigerant: Class I, Class II, or a blend containing ODS.
- Substitute-only appliances are not covered by current § 82.157.
AIM Act
Current AIM Act applicability:
- Leak-repair requirements began January 1, 2026.
- Full charge: 15 lb or more.
- Refrigerant: HFC or an HFC substitute with GWP greater than 53.
- Trigger rates:
- Industrial process refrigeration: 30%
- Commercial refrigeration: 20%
- Comfort cooling and other qualifying appliances: 10%
- Appliances containing solely ODS are excluded from this AIM Act leak-repair provision.
- Residential and light-commercial air-conditioning and heat-pump subsector is excluded from § 84.106.
Similar percentages do not make Section 608 and the AIM Act the same program.
10. Current-Versus-Legacy Warnings
| Legacy Statement or Term | Current Interpretation |
|---|---|
| Commercial refrigeration leak trigger = 35% | Historical Section 608 value; current applicable trigger is 20% |
| Industrial process refrigeration leak trigger = 35% | Historical value; current applicable trigger is 30% |
| Comfort-cooling leak trigger = 15% | Historical value; current applicable trigger is 10% |
| HFC refrigerant sales are unrestricted | Outdated; non-exempt substitute sales have been restricted since January 1, 2018 |
| R-22 was “banned” in 2020 | Incomplete; production/import of HCFC-22 ended, but existing equipment may continue to use lawful supplies |
| All HCFC production/import ended in 2020 | Incorrect; the final U.S. HCFC production/import step is scheduled for 2030 |
| $25,000, $27,500, $32,500, or $37,500 per day is the permanent Section 608 fine | Historical figures; current monetary maximums must be checked in 40 CFR § 19.4 |
| ARI is simply an outdated typo | Incorrect; historical standards correctly retain the ARI designation |
| Every old ARI standard should be renamed AHRI | Incorrect; use ARI 740-1993, ARI 740-1995, and AHRI 740-2016 as designated |
| Recovery standard is selected from the service date | Incorrect; use the recovery-equipment manufacture or import date |
| The 2020 Section 608 revision removed HFC venting and sales restrictions | Incorrect; the revision removed substitute-only appliances from § 82.157 leak repair, not the retained venting and sales provisions |
| Section 608 is now the only HFC leak-repair program | Incorrect; separate AIM Act requirements can apply beginning January 1, 2026 |
| A proposed rule is already law | Incorrect; current eCFR controls until a final rule is effective |
Recovery-Equipment Standard Dates
| Recovery/Recycle Equipment Manufacture or Import Date | Standard / Treatment |
|---|---|
| Before November 15, 1993 | Older regulatory performance pathway |
| November 15, 1993–September 21, 2003 | ARI Standard 740-1993 / Appendix B1 |
| September 22, 2003–December 31, 2016 | ARI Standard 740-1995 / Appendix B2 |
| January 1, 2017 and later — nonflammable refrigerants | AHRI Standard 740-2016 / Appendix B3 |
| January 1, 2017 and later — flammable refrigerants | AHRI Standard 740-2016 with applicable flammable-refrigerant provisions / Appendix B4 |
Older recovery equipment is not automatically illegal merely because a newer standard exists.
11. Penalty Reminder
Current Maximums
The current 40 CFR § 19.4 table used in Section 2.8 lists:
| Clean Air Act Enforcement Path | Current Maximum Used in This Module |
|---|---|
| § 113(b) civil judicial penalty | $124,426 per day per violation |
| § 113(d)(1) administrative penalty | $59,114 per day per violation |
| Administrative action-level maximum shown in the table | $472,901 |
These are statutory maximums, not automatic fines. Civil monetary penalties are date-sensitive and must be reverified before future reuse.
12. High-Priority Numbers and Dates
| Number / Date | Meaning |
|---|---|
| 15–40 km | Approximate ozone-layer region used in this module |
| CFC-11 = 1.0 | ODP reference |
| CO₂ = 1 | GWP reference |
| 1987 | Montreal Protocol adopted |
| 1989 | Montreal Protocol entered into force |
| 1996 | Principal U.S. CFC/Class I production-import phaseout date |
| January 1, 2018 | Sales restriction extended to non-exempt substitutes |
| January 1, 2019 | Lower Section 608 leak rates became effective |
| 2020 | U.S. production/import of HCFC-22 and HCFC-142b ended |
| 2030 | Remaining U.S. HCFC production/import scheduled to end |
| 2 lb or less | Maximum container design size for qualifying substitute MVAC small-can sales exception |
| 3 years | Common retailer and specified technician record-retention period |
| More than 5 lb and less than 50 lb | Disposal-record range described in Section 2.7 |
| 50 lb or more | Current Section 608 § 82.157 full-charge threshold |
| 30% / 20% / 10% | Current Section 608 IPR / commercial / comfort-cooling and other triggers |
| 125% | Calendar-year full-charge loss that triggers the Section 608 chronic-leak report |
| March 1 | Chronic-leak report deadline in the following year |
| January 1, 2026 | Current AIM Act leak-repair requirements began |
| 15 lb or more | AIM Act § 84.106 full-charge threshold |
| 1,500 lb or more | Charge level used for specified AIM Act automatic-leak-detection requirements |
13. Frequently Confused Concepts
| Do Not Confuse | Correct Distinction |
|---|---|
| Ground-level ozone and stratospheric ozone | Same molecule, very different environmental role |
| ODP and GWP | Ozone depletion and climate impact are different metrics |
| Zero ODP and zero environmental impact | Zero ODP does not imply zero GWP or zero safety concern |
| CFC and HCFC | Both contain chlorine; HCFCs also contain hydrogen and generally have lower ODP |
| HFC and HFO | Both lack chlorine; HFO contains a carbon-carbon double bond and generally has lower GWP |
| Phaseout and equipment-use ban | Production/import phaseout does not automatically prohibit continued operation |
| De minimis and “small enough to vent” | De minimis must be incidental to a good-faith compliant recovery/recycling/disposal effort |
| Normal-operation emission and permission to create a leak | Normal operation is a separate category; deliberately creating a release is not justified by operation |
| Nitrogen-only discharge and nitrogen/refrigerant mixture | Nitrogen alone is exempt; a mixture containing covered refrigerant must be recovered |
| Section 608 and Section 609 purchase authority | Section 609 does not authorize stationary-refrigerant purchases |
| Purchase authority and service authority | Legal purchase does not automatically authorize every service activity |
| Recovered and reclaimed refrigerant | Used refrigerant generally must be reclaimed before sale to a new owner |
| Same-owner reuse and sale | They are not the same transaction |
| Current Section 608 and AIM Act leak repair | Similar rates, different statutes, refrigerant scopes, thresholds, and exclusions |
| Maximum penalty and actual assessed penalty | A statutory maximum is not the automatic fine |
| ARI and AHRI | AHRI is the current organization; historical ARI standards retain their original names |
14. Module 2 Exam-Reading Reminders
Before answering a regulatory question, identify:
- Is the question scientific or regulatory?
- What refrigerant family or substance is involved?
- Is the rule current or historical?
- What date controls?
- Is the question Section 608, Section 609, or AIM Act?
- Is the equipment stationary or MVAC?
- Is the issue venting, sales, leak repair, recovery, disposal, or recordkeeping?
- Is an exemption broad or end-use specific?
- Does the question ask for a statutory maximum or an actual penalty?
- Does an old answer choice reflect a legacy rule?
High-Risk Words
- Current
- Historical
- Before
- After
- Exempt
- Non-exempt
- Intentional
- De minimis
- Stationary
- MVAC
- Maximum
- Required
- Prohibited
15. Detailed-Section Links
- Section 2.1 - The Ozone Layer
- Section 2.2 - Ozone Depletion Process
- Section 2.3 - Refrigerant Families ODP and GWP
- Section 2.4 - Clean Air Act and Montreal Protocol
- Section 2.5 - Venting Prohibition
- Section 2.6 - Refrigerant Sales Restrictions
- Section 2.7 - Enforcement Recordkeeping and Professional Responsibility
- Section 2.8 - Current and Historical Regulation Comparison