About Len's Clean Air
For more than 25 years, Len's Clean Air has been keeping Northern Ontario's trucks and fleets running clean, compliant, and on the road.
Founded in 1999 by owner-operator Len Gaudette, the company was built on a simple idea: that heavy duty operators deserve emissions and DPF service they can actually count on — fast, honest, and done right the first time. What started as one dedicated specialist with deep expertise in diesel emissions has grown into Greater Sudbury's go-to name for mobile emission testing and diesel particulate filter cleaning.
From the beginning, Len understood the reality of running commercial vehicles in the North: every hour a truck sits idle is money lost. That's why Len's Clean Air was designed around a fully mobile model — bringing accredited testing and on-site service directly to the customer's yard, instead of forcing operators to bring their vehicles in and wait. As an Ontario Drive Clean Accredited Test Facility, the company delivers certified results that keep fleets legal and registrations renewed, without the runaround.
Leonard Gaudette
Since 1999, Len has been the trusted name in heavy duty diesel emissions and DPF cleaning across Greater Sudbury and Northern Ontario. As the owner and operator — not a call center, not a rotating crew — Len personally brings more than 25 years of hands-on expertise to every vehicle he services. When you call Len's Clean Air, you're dealing directly with the specialist himself.
Len built his reputation the hard way: one honest job at a time. Fleet operators across the North know him as the person who drops everything to get them back on the road, the expert who does the work right the first time, and the reliable partner they can count on when they're in a crunch. That kind of trust isn't advertised — it's earned over decades.
As an Ontario Drive Clean Accredited specialist, Len combines certified, compliant testing with a genuine, no-nonsense commitment to his customers. His fully mobile approach means he comes to you, keeping your trucks working and your business moving. For Len, it has never just been about passing an emissions test — it's about keeping Northern Ontario's operators on the road, running clean, and coming back year after year.
Our Values
Straight Answers, Every Time
We give you an honest diagnosis of your emissions and DPF — telling you exactly what your equipment needs and nothing it doesn't. No unnecessary work, no padded invoices, just the truth so you can make the right call for your fleet.
We Come to You
Our fully mobile service brings accredited emission testing and DPF work right to your yard. That means less downtime, no hauling trucks across town, and your fleet stays working while we handle the job on-site.
Certified & Compliant
As an Ontario Drive Clean Accredited facility, we deliver legitimate, recognized results that keep your heavy duty vehicles road-legal. Done right the first time — so you avoid failed tests, expired plates, and costly delays.
Your Emissions Guy, Not a Franchise
When you call Len's Clean Air, you deal directly with the specialist doing the work — not a call center or a rotating crew. It's owner-operated, personal, and built on relationships that keep Northern Ontario's operators coming back.
Serving Northern Ontario
We proudly serve fleet operators, trucking companies, and heavy duty vehicle owners throughout Northern Ontario. Don't see your area listed? Get in touch — with our fully mobile service, we may still be able to come to you.
