Summary
Details
- Global
Mandatory: Parties must control production and consumption of listed substances under agreed schedules.
Functionally mandatory: Companies must comply with national licensing, quota, import, export and product rules.
Stronger requirements: Controlled substances, refrigerants, HVAC equipment, foams, fire suppression systems and cold chain sectors.
Some essential-use, critical-use or servicing exemptions may apply depending on substance, use and national law.
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What’s Required
The Montreal Protocol on Substances that Deplete the Ozone Layer is a global agreement under the ozone treaty regime. Its purpose is to protect the Earth’s ozone layer by phasing out chemicals that deplete it.
The framework includes:
Controls on ozone-depleting substances.
Phase-out schedules for controlled substances.
Differentiated obligations for developed and developing countries.
Licensing systems for imports and exports.
Reporting of production and consumption.
Trade restrictions with non-Parties.
Technical and financial support through the Multilateral Fund.
Amendments adding new substances and controls.
Kigali Amendment phase-down of HFCs.
The UNEP Ozone Secretariat describes the Montreal Protocol as a global agreement to protect the Earth’s ozone layer by phasing out chemicals that deplete it.
1. Controlled Substances and Product Categories
The Montreal Protocol regulates production and consumption of controlled substances.
Affected substance categories include:
Chlorofluorocarbons.
Halons.
Carbon tetrachloride.
Methyl chloroform.
Hydrochlorofluorocarbons.
Methyl bromide.
Other ozone-depleting substances controlled through annexes and amendments.
Hydrofluorocarbons under the Kigali Amendment.
Affected product and supply chain areas include:
Refrigeration.
Air conditioning.
Heat pumps.
Insulation foams.
Aerosols.
Fire suppression.
Solvents.
Cold chains.
Data centre cooling.
Supermarkets.
Medical and laboratory uses.
Industrial process applications.
This creates a global chemical phase-out model, where specific substances are progressively removed from production and consumption.
2. Ozone-Depleting Substance Phase-Out
The core compliance action is the phase-out of ozone-depleting substances.
Countries must control:
Production.
Consumption.
Imports.
Exports.
Stockpiles.
Use exemptions.
Destruction and recovery.
Reporting.
Companies are affected through national implementation laws that may restrict:
Manufacture.
Import.
Export.
Placing on the market.
Servicing of equipment.
Use of virgin controlled substances.
Sale of controlled products.
Disposal and recovery obligations.
The Ozone Secretariat states that the Protocol has successfully met its objectives so far and continues to safeguard the ozone layer today.
This creates a substance phase-out and market-access regime, where companies must transition to compliant alternatives or risk losing legal access to markets.
3. Kigali Amendment and HFC Climate Governance
The Kigali Amendment extended the Montreal Protocol regime to hydrofluorocarbons.
HFCs do not deplete the ozone layer, but they are powerful greenhouse gases widely used in refrigeration and air conditioning.
The Ozone Secretariat describes the Kigali Amendment as a legally binding global agreement aiming to phase down HFCs, which are extremely potent greenhouse gases used widely in refrigeration and air conditioning.
UNDP states that the Kigali Amendment will reduce HFC production and consumption by more than 80% over the next 30 years and could avoid up to 0.4°C of global warming by the end of this century if fully implemented.
This creates a cooling-sector climate governance model, where refrigerant transition is central to both ozone protection and climate mitigation.
4. Reporting, Licensing and Trade Controls
Parties must report production and consumption data for controlled substances.
National implementation often requires:
Import licensing.
Export licensing.
Quota systems.
Customs controls.
Company registration.
Product restrictions.
Recordkeeping.
Annual reporting.
Enforcement against illegal trade.
This creates a chemical trade governance system, where refrigerants and controlled substances cannot move freely without documentation and legal authorisation.
The Montreal Protocol also restricts trade with non-Parties, helping prevent market leakage and illegal substance flows.
5. Multilateral Fund and Technology Transition
A distinctive feature is the Multilateral Fund, which supports developing countries in meeting their obligations.
The fund has helped finance:
Technology conversion.
Industrial process changes.
Refrigerant transition.
Capacity building.
Customs training.
Policy development.
Recovery and recycling systems.
Alternative technology deployment.
This creates a global implementation finance model, where developed countries support developing country phase-out and phase-down obligations.
The result is that the Montreal Protocol combines legal controls with practical technology transition support.
6. Supply Chain and Scope 3 Implications
The Montreal Protocol affects corporate value chains even though obligations are implemented through national laws.
Affected companies include:
Refrigerant producers.
Chemical manufacturers.
HVAC equipment manufacturers.
Appliance manufacturers.
Supermarkets.
Data centres.
Cold chain logistics providers.
Pharmaceutical cold chains.
Foam manufacturers.
Fire suppression suppliers.
Building materials companies.
Automotive air conditioning suppliers.
Waste and refrigerant recovery companies.
Companies must manage:
Refrigerant selection.
Equipment redesign.
Supplier compliance.
Refrigerant leakage.
Servicing and maintenance.
End-of-life recovery.
Product labelling.
Import/export restrictions.
Lifecycle climate impact.
This creates a product and service supply chain transition model, where compliance depends on both chemical substitution and equipment redesign.
7. Cooling, Energy Efficiency and Climate Co-Benefits
The Kigali Amendment makes cooling efficiency strategically important.
HFC phase-down affects:
Air conditioning.
Heat pumps.
Commercial refrigeration.
Industrial refrigeration.
Cold storage.
Transport refrigeration.
Data centre cooling.
Companies need to avoid replacing high-GWP refrigerants with alternatives that reduce direct emissions but increase electricity use.
This creates a refrigerant-plus-efficiency governance model, where the best sustainability outcome depends on both:
Low global warming potential refrigerants.
High energy efficiency equipment.
This is critical because cooling demand is growing rapidly in hot climates, cities, food systems and digital infrastructure.
8. Audit, Verification and Monitoring Systems
Compliance is monitored through:
National reporting to the Ozone Secretariat.
Import/export licensing systems.
Customs checks.
Quota systems.
Market surveillance.
Illegal trade enforcement.
Equipment and product inspections.
Recovery and destruction documentation.
Meeting of the Parties review processes.
Implementation Committee procedures.
Companies must:
Track controlled substances.
Maintain import/export records.
Verify supplier compliance.
Use licensed refrigerants.
Manage servicing records.
Recover and dispose of controlled substances correctly.
Avoid illegal refrigerant trade.
Prepare for inspections.
This creates a multi-level enforcement system, combining treaty reporting, national chemical regulation and customs control.
9. Procurement Integration and Supplier Segmentation
Procurement teams should segment suppliers based on refrigerant and controlled-substance risk.
High-risk categories include:
HVAC suppliers.
Refrigeration equipment suppliers.
Refrigerant distributors.
Foam suppliers.
Fire suppression suppliers.
Cold chain providers.
Data centre cooling suppliers.
Vehicle air conditioning suppliers.
Maintenance contractors.
Waste refrigerant handlers.
Suppliers may need to provide:
Refrigerant type.
GWP value.
ODP value.
Compliance documentation.
Import/export evidence.
Servicing records.
Leak management data.
Recovery and destruction certificates.
Alternative technology specifications.
This creates a chemical-substitution procurement model, where supplier approval depends on substance legality, climate impact and end-of-life controls.
Important Deadlines
Key timelines include:
1987: Montreal Protocol agreed.
1989: Montreal Protocol entered into force.
1990, 1992, 1997, 1999: Major amendments added controls and strengthened obligations.
2016: Kigali Amendment agreed in Kigali, Rwanda.
2019 onward: Kigali Amendment HFC phase-down begins for many developed countries.
2024 onward: Many developing countries begin HFC freeze or phase-down schedules.
2028 onward: Later-start developing country groups begin HFC schedules.
Ongoing: Countries report controlled substance production and consumption and implement national licensing and quota systems.
Current Status
The Montreal Protocol is active and remains one of the most important global environmental treaties.
Current focus areas include:
Completing HCFC phase-out.
Implementing Kigali HFC phase-down schedules.
Preventing illegal trade.
Managing refrigerant banks.
Promoting low-GWP alternatives.
Improving cooling efficiency.
Financing technology transition.
Supporting developing country implementation.
Addressing lifecycle emissions from cooling systems.
The Ozone Secretariat states that the most recent amendment, the Kigali Amendment, called for the phase-down of HFCs in 2016 and that HFCs are powerful greenhouse gases even though they do not deplete ozone.
Penalties for Non-Compliance
Potential consequences include:
Import refusal.
Export prohibition.
Loss of licence or quota.
Product bans.
Customs seizure.
Fines under national law.
Criminal enforcement for illegal trade.
Equipment sales restrictions.
Contract termination.
Reputational damage.
Loss of market access.
Because the treaty is implemented nationally, penalties are applied by countries through domestic laws and enforcement authorities.
Examples of Known Failure Modes
Typical risks include:
Importing controlled substances without licences.
Selling banned refrigerants.
Misdeclaring refrigerant shipments.
Using illegal or counterfeit refrigerants.
Failing to recover refrigerants at end of life.
Using high-GWP refrigerants where phasedown applies.
Poor leak detection and servicing practices.
Replacing refrigerants without efficiency analysis.
Incomplete supplier documentation.
Failure to track refrigerant banks.
Weak customs controls and illegal trade routes.
These failures can lead to regulatory penalties, product restrictions, and climate performance problems.
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