Is ISO 23875 Mandatory in Canada? What the Law Actually Requires

ISO 23875 does not make this cab compliant. Provincial exposure limits decide that, and they are not the same in every province.

The question I get asked most about cab air is whether ISO 23875 is mandatory in Canada. It is not. It is a voluntary international standard, and no Canadian occupational health and safety regulation makes it law. That answer disappoints people at first, because a mandatory standard is easy to budget for. Then they realise the useful part. Canadian law does have something to say about the air an operator breathes for twelve hours a day, it says it province by province, and almost nobody has read it.

I write this for the person who has to sign the exposure control plan. You are the one holding the document when an officer asks how you know the air in that cab is clean. What helps in that moment is knowing which duty is actually yours, and holding something that speaks to it.

Is ISO 23875 mandatory in Canada?

No. ISO 23875 is a voluntary international standard covering air quality control systems for operator enclosures. No Canadian occupational health and safety regulation adopts it, references it, or requires it. ISO says as much itself: the standard's own front matter points readers to an explanation of the voluntary nature of standards.

It is easy to see why the two get blurred. The standard and the regulations often turn up in the same sentence, and they are doing different jobs. A standard is a technical document that a buyer may choose to specify. A regulation is law made by a government, and in Canada air quality law is provincial and territorial. Nothing in ISO 23875 obliges a Canadian company to do anything, and no regulator here can cite it as the rule you broke. What the standard can do is give you a recognised way to show your cabs are holding the air you say they are, which is why a lot of sites specify it even though nobody makes them.

There is also no accredited third party certification scheme behind the standard, so nobody independent is auditing anyone's cab. Conformity runs on self declaration. What the standard does require is that the machine manufacturer or the installer of the air quality control system provide a supplier's declaration of conformity, stating that the enclosure and its filtration conform to the document. The amendment published the following year left that requirement untouched.

That changes the question you should be asking. Not whether a cab is certified, because it cannot be. Ask instead whether anyone at your site can produce the declaration of conformity for the cabs you already own. Most people have never been asked for it, and it is not usually in the handover package. If you can find yours, send it to me and I will tell you what you are holding. There are two documents in play and they are easy to mix up. A commissioning record says what a cab achieved on the day it was fitted. A declaration of conformity is the separate statement that the system conforms to the standard, and it follows the full test. Both are useful. They are not the same page.

If the standard is voluntary, what does Canadian law actually require?

Canadian law requires the organization running the workplace to keep worker exposure to airborne contaminants at or below the limit set in that jurisdiction, and to eliminate or control the hazard rather than manage it with paperwork. The duty is on the company and the site. It is not on the person in the seat.

Each province and territory sets its own limits and publishes its own table. They are not the same table, they are not maintained on the same schedule, and they do not move together. British Columbia sets its limits in regulation, and WorkSafeBC publishes a table of them for convenience, which is not itself the enacted version. Alberta keeps its limits inside its own code. A national contractor working across the western provinces is working to more than one number for the same dust, and to two different documents that get updated at different times.

That is the part worth sitting with. If you run crews in two provinces and you are applying one exposure figure to both, one of those sites is being measured against a limit that does not apply to it. If you want to know which one, that is a short conversation and I am glad to have it with you.

Does the dust in my cab count as an exposure my site has to control?

Almost certainly yes. Respirable crystalline silica is present in most Canadian mining, aggregate, construction and oil sands work, and the International Agency for Research on Cancer classifies quartz silica as carcinogenic to humans. It is also controllable, and Alberta names it among the substances a workplace must have a written code of practice for.

Notice what that means, because it is stronger than an exposure number. A code of practice is a document you have to produce and maintain. It is not satisfied by a filter purchase. It has to say how exposure is assessed, how it is controlled, and how you know the control is still working. The same code separately requires health assessments for workers exposed to silica, which means the obligation reaches into your medical surveillance program too, not only your equipment budget.

Coal dust, grain dust and wood dust each carry their own limits, and they are not interchangeable. There is also a catch-all limit for particulate that is not otherwise regulated. It is the number a site lands on when the dust has never been analysed, and it is generous enough that you can sit comfortably inside a limit that was never the right one for your material. If nobody at your site can tell you what is in the dust, that is the first thing to fix, and we can guide you through that as well.

Who is legally responsible for cab air quality on my site?

The organization running the workplace carries the duty, and it pushes that duty down to its contractors through the terms it sets. Operators and tradespeople can raise the issue with their employer and use the workplace rights their jurisdiction gives them, but they do not own the obligation and they cannot discharge it.

This matters for how the money moves. When a site decides its cabs will hold clean air, that decision reaches every contractor fleet on the property, including the ones the site does not own. Contractors told about it late are buying under time pressure, which is the worst condition to make that decision in. Told early, they have room to do it properly.

There is a second question sitting underneath that one, and it catches people out. Which body actually inspects your site? The authority that publishes the exposure limits you are measuring against is not always the same authority that walks onto a property, and the answer moves depending on the province and on the kind of operation you run. If you are not certain which one applies to you, settle it before the day you need to know. I can point you at the right starting place in about five minutes.

Does a twelve hour shift change the exposure limit?

A longer shift can change the limit that applies. Alberta's code carries a separate provision dealing with exposure during shifts longer than eight hours, and the tables are written against an eight hour day. Adjustment is not uniform across substances. The tables carry notations that change the answer contaminant by contaminant.

Most heavy industrial rotations out here are not eight hours, which makes the useful question a different one. Not whether your limit should have been adjusted, but whether anybody made that decision on purpose and wrote it down.

So here is the thing to go and check tonight. Pull the last air sampling report for your operators and look for a line stating what basis the result was compared against and whether shift length was accounted for. Does yours say? If it does not, that report cannot tell you whether the exposure was under the limit for the rotation your crews actually work. It still reads like an answer, which is the dangerous part.

I can tell you what to ask your industrial hygienist so the next report states its basis on the face of it, and which substances at your site the adjustment question actually bites on. That takes one phone call and costs you nothing.

What does ISO 23875 not cover?

The standard is narrower than most people assume. It covers pressurization, filtration, respirable particulate and carbon dioxide inside the enclosure. It expressly excludes gases and vapours that can be a hazard in the work environment outside the enclosure. Its design specifications are also universal by design and do not contemplate specific mining environments.

Read that exclusion again if you run diesel equipment. The gas side of diesel exhaust sits outside what the standard addresses. A cab built entirely to the standard has still not been asked to do anything about it. That is not a criticism of the standard. It is a good document doing the job it set out to do, and it says plainly where that job ends, which is more than most documents manage. It does mean one standard is not a complete answer to a site's air. Knowing the edges of it is what lets you build the rest of the plan around it with confidence.

The universal design point matters too. A standard written to apply everywhere cannot know what your pit throws at a machine in August, or what a haul road does to an intake in freeze thaw. Somebody still has to look at your equipment. That is the part I do.

How do I prove a cab is actually doing what I say it is doing?

You prove it with pressure and with a record. A cab held at a higher pressure than the air around it keeps dust from being drawn in through the gaps every cab has, at door seals, at wiring penetrations, at the joints that vibration works loose. That is what a cabin pressuriser is for, and BreatheSafe is the system we fit.

Pressure alone is not proof, though. A commissioning sheet tells you what a cab did on one morning, and cabs do not stay commissioned. Seals age. Filters load. Somebody props a door open in July and the habit sticks. Continuous monitoring is what turns a claim into a record, and the record it builds is measured in years rather than weeks, which is the timescale an exposure argument actually runs on.

That record is the thing you want in your hand when somebody asks how you know. We supply the monitoring that produces it, and we can show you what the data looks like before you commit to anything.

What should I ask before buying a cab air system?

Ask four questions, and ask them of every supplier including me. What is the dust at my site actually made of. What pressure will this cab hold under working vibration, not on a shop floor. What proves it a year from now. And what happens to the gas side of my diesel exhaust, which no cab standard addresses.

The first two have clean answers and any supplier will give them to you. The third and fourth are where the conversation gets useful, because they are about what happens after the invoice, and they are the ones worth pressing on with me as much as with anybody else.

If you want to go further into what happens to that same dust once it settles out of the air and into a building, that is a different set of rules and a different risk, and I have written about combustible dust in Canadian plants separately.

Back to the person signing the plan. You do not need ISO 23875 to be mandatory for it to be useful. It is a genuinely good tool for showing your cabs hold the air you say they hold. It is just not the thing Canadian law asks you about, and knowing the difference puts you in a stronger position, not a weaker one. What you need is to know which limit applies to your site, whether your sampling was adjusted for the shift your crews actually work, and whether the cab is still doing today what it did the day it was commissioned. Three questions. I will walk through all three with you on one call, and you can get in touch here.

Got a dust problem? Tell us where it's a problem and we'll fix it.

Lisa Rochon | lisa@lineva.ca | 587-407-2870 | www.lineva-air-solutions.ca