CWMA Waste Stream Watch

Main Issues Identified Across BC

• Increases in abandoned canisters: Multiple jurisdictions report significant upticks, with one site showing a jump from 15 kg in 2023 to 324 kg so far in 2025.
  Metro Vancouver, specifically, is now seeing large 3-litre nitrous oxide cylinders at recycling and waste centres, in addition to smaller whipped cream chargers reported elsewhere.
• High and rising disposal costs: Hazardous waste collection costs have increased, and for one reporting, it was approximately 150% since earlier this year. Costs vary significantly between service providers, with some lacking clear details on management methods.
• Infrastructure damage and safety risks: Metro Vancouver reports process interruptions and equipment damage at their Waste-to-Energy Facility, believed to be caused by canisters releasing nitrous oxide into the combustion chamber.
• Regulatory uncertainty: There was confusion about whether these canisters are covered under the new BC Recycling Regulation updates. NOTE: CWMA has confirmed that single-use nitrous oxide canisters are included under the recent amendments to the Recycling Regulation that capture pressurized non-refillable canisters. More details on the types will be forthcoming.

• Few have successful processes for recycling these, so they are just storing them at this point.

Current Management Approaches

Different sites across BC are handling this in various ways:

• Most store canisters indefinitely stored in totes or mega bags, grouping by UN hazard numbers
• A few have found metal recyclers willing to accept them.
• Some empty canisters for scrap metal disposal (where a release valve exists).
• Some are in the process of developing protocols with operators, including third-party risk assessments and Operating Plans to meet BC Occupational Health and Safety and Hazardous Waste Regulations.
• One depot is exploring pressure release valves, removing brass seals once depressurized.
• Some will focus on communicating that empty cylinders with valves removed are acceptable as scrap metal

Emerging Solutions

Metro Vancouver’s coordinated approach:

• Update: Nitrous Oxide Cylinders at Metro Vancouver Recycling and Waste Centres
• Developing a communications strategy to encourage proper recycling at designated depots rather than garbage disposal.
• Recycling Council of BC now tracking disposal inquiries by area to measure demand and campaign effectiveness.
• Working with operators to secure hazardous waste collection services.
• One operator engaging consultants for formal risk assessments and operating procedures.

General Challenges

• Canisters still contain pressure, making them hazardous.
• Staff lack training for safe handling (though some have TDG certification).
• No formal take-back program or EPR coverage is yet in place.
• Items readily available online (Amazon) with no regulation.
• Often abandoned anonymously, making enforcement impossible.
• Licensed haulers are expensive and primarily located in Vancouver.
• Lack of clarity on managing canisters containing residue.

Information Needs

Everyone is generally seeking:

• Tracking of disposal trends over time.
• Best practices for engaging residents, businesses, and service providers.
• Developments related to the disposal of canisters with residue in BC.
• Information on sales/availability trends
• Safe depressurization methods and cost-effective disposal solutions.
• Clarification on regulatory coverage.

Helpful Links

• Bulletin from Health Canada (last updated on November 20, 2025)

• Up: The rise of nitrous oxide abuse. An international survey of contemporary nitrous oxide use: https://pubmed.ncbi.nlm.nih.gov/26912510/

• Veolia starts UK’s first safe treatment for nitrous oxide canisters: https://www.veolia.co.uk/press-releases/veolia-starts-uks-first-safe-treatment-nitrous-oxide-canisters#

Global Perspective

💥 1. Primary Challenge: Explosions and Fire Risk

The most significant issue is that users improperly dispose of the containers in general waste, mixed recycling, or as litter.

• Risk: Any pressurized cylinder, even those thought to be empty, can explode when subjected to the crushing forces of compactors, shredders, or, most dangerously, the high heat of incinerators. Nitrous oxide is an oxidizer (it fuels existing fires), making any explosion in a waste facility an immediate fire hazard.

• Consequence: Waste facilities, particularly incineration plants, have reported a surge in explosions. For example, Oslo, Norway waste incineration plant registered around 200 explosions in a single year, averaging 3–4 blasts per week, resulting in significant operational downtime, costly equipment repairs, and major safety hazards for workers.



🛠️ 2. Solutions: Detection, Sorting, and Specialized Equipment

• Intelligent Detection Technology (MIS): Some facilities are piloting and deploying advanced sorting technology that can detect metal objects and pressurized containers hidden within general waste streams before they reach the shredder or incinerator. This is a crucial step for pre-emptively removing the hazard.

• Manual Sorting and Inspection: Workers are being trained to recognize and manually remove the canisters from waste streams before processing. This is particularly difficult with the small cartridges (“whippits”) but necessary for the larger, more visible cylinders.

• Specialized Collection Programs: Municipalities and regional waste agencies are often classifying the compressed gas containers as Household Hazardous Waste (HHW) or Special Waste. This requires residents to drop them off at designated recycling centres or transfer stations, keeping them out of curbside collection bins.



♻️ 3. Handling Disposal and Recycling

Nitrous oxide canisters are made of steel, which is 100% recyclable, but only if handled correctly. Hazardous waste organizations are focused on safe depressurization:

• Mandatory Emptying: The primary directive for the public and commercial users is that the canisters must be completely empty before disposal. 

• Scrap Metal Recycling: When safely emptied, both small cartridges and large cylinders can be accepted at scrap metal yards or dedicated metal recycling programs. This allows the valuable steel to be recovered.

• Commercial Recycling Services: Private companies in BC specialize in safe depressurization and metal recovery for bulk quantities of N2O tanks, catering to both legitimate businesses and attempting to offer a responsible disposal route for sites with large amounts of cylinders.



📣 4. Public Awareness and Regulatory Response


• Targeted Education: Campaigns are being launched to educate the public, especially young people, on:
  • The health harms of recreational use.
  • The environmental impact (Nitrous Oxide is a potent greenhouse gas, N2O, with a Global Warming Potential (GWP) of 265 times that of CO2 over 100 years).
  • The proper disposal method (bringing them to a specialized centre or safely emptying them for scrap metal recycling)

• Regulatory Measures: Many countries and local authorities are implementing measures to restrict the supply, such as:
  • Restricting the maximum quantity that can be sold at one time.

  • Implementing age-restricted sales (18+).

  • Prohibiting the sale of products that facilitate recreational use (like “crackers” or combined sales of large tanks and balloons)

Deep Dive: About Nitrous Oxide

The types of Nitrous Oxide containers that can be purchased by the public are primarily marketed for culinary purposes, specifically for making whipped cream.

Here is a summary of the most common types of containers:

1. Small Whipped Cream Chargers (Cartridges/Whippits)

• Size: These are small, disposable, non-refillable steel cartridges, typically containing 8 grams (or sometimes 8.2g) of food-grade N2O
• Purpose: They are designed to be used with a mechanical whipped cream dispenser (or cream whipper/siphon) to turn liquid cream into whipped cream.
• Availability: They are widely sold in multipacks (e.g., 10-pack, 50-pack, 100-pack, or larger “master cases”) at grocery stores, kitchen supply stores, and online retailers.
• Legality Note: While their sale for culinary use is generally permissible, many jurisdictions restrict their sale or use if the seller believes they are intended for inhalation or recreational use, and some countries have banned their sale for recreational purposes altogether.

2. Large Nitrous Oxide Cylinders (Tanks)

• Size: These are much larger, single-use, disposable cylinders or tanks, typically containing from 615 grams to 3000 grams (e.g., 635g, 640g, 1364g, 2000g, 3000g) of food-grade $N_2O$.
• Purpose: They are marketed as an efficient and high-volume solution for refilling whipped cream dispensers, especially for commercial catering or high-volume home use. They usually require a separate pressure regulator for safe and controlled dispensing.
• Features: They are often made of recyclable steel and may come with a nozzle for discharging residual gas before recycling. Some may even be sold in various flavours (though the flavour is often for the whipped cream, not the gas itself).
• Availability: These larger tanks are commonly sold through online retailers, smoke shops, and specialized food/catering suppliers.
• Legality Note: Similar to the smaller cartridges, their legal status is tied to their intended use (culinary vs. recreational inhalation), and many jurisdictions actively warn against or prohibit their sale for recreational purposes.

⚠️ Recreational Use

It is important to note that inhalation of nitrous oxide for recreational purposes is dangerous and strongly discouraged by health authorities like Health Canada.

Inhalation can cause serious immediate and long-term health risks, including:

• • Asphyxiation or death due to lack of oxygen.
  • Frostbite of the throat, nose, and lungs if inhaled directly from the container.
  • Vitamin B12 deficiency and nerve damage (neuropathy) with repeated use.

The containers mentioned above are sold for food preparation, and their sale for inhalation is strictly prohibited in many places.