You’ve got trucks to run, deadlines to meet, and inspectors breathing down your neck. Let us take one thing off your plate.
If you operate a diesel truck or fleet in California, you already know about the CARB Clean Truck Check (HD I/M) program or you’re about to learn the hard way. That means state-mandated emissions testing, strict deadlines, and automated enforcement that doesn’t care about your schedule.
At Darling Smog, we specialize in fast, no-nonsense diesel testing that meets CARB’s latest regulations (which keep evolving) without tying up your vehicles or wasting your day.
Whether you’re a one-truck contractor or managing 20+ units across the Southland, our test-only station keeps you compliant, off CARB’s radar, and out of trouble. (Already have a citation? Happens! Let’s get you back into compliance ASAP.)
We Handle:
Smoke opacity testing for older or pre-OBD vehicles
OBD II tests for 2013+ diesel trucks
Visual inspections for required CARB CTC program years
Full documentation & test reporting
Fleet appointments & mobile testing (available by request)
What Sets Us Apart?
We don’t do repairs. We don’t do scare tactics. We just test, document it right, and get you back on the road.
Same-day appointments available (based on availability). No need to wait, get in and get out.
We test fleets. Schedule your crew dropping off/picking up at our shop or call us for mobile coordination to your site.
Located in Glendora, right on Route 66 . We’re close to the freeway and near some great food if you want to grab a bite while we test.
Licensed by BAR & CARB. We are across the board emissions pros.
And because we’re a woman & veteran-owned business, we take your time and trust seriously. We’ve worked with contractors, independent drivers, and commercial yard admins and we know this program’s a moving target.
Ready to Get It Done?
Skip the confusion. Skip the upsells. Come test with someone who gets it.
