If your diesel vehicle needs a smoke opacity test, you don’t have time to waste. At Darling Smog, we offer mobile CARB-compliant smoke opacity testing for fleets, big rigs, buses, and RVs anywhere in Glendora, the San Gabriel Valley, or Greater LA.
We’re a woman and veteran-owned shop that understands the pressure to stay compliant without losing a day of work. That’s why we bring the test site to you.
What We Test:
Heavy-duty diesel trucks
School buses & fleet vehicles
RVs & motorhomes
Vehicles subject to CARB Clean Truck Check
Where We Go:
We offer on-site mobile testing throughout:
Glendora, Covina, Azusa, La Verne
Los Angeles & San Gabriel Valley
Job sites, yards, terminals, and even parking lots
Why Choose Darling Smog?
✅ Fully CARB-compliant ✅ Fast, mobile appointments ✅ No upsells, only testing
✅ Same-day and emergency slots may be available—please call or inquire online
We’re licensed, friendly, and efficient. You’ll always know what to expect. We’re here to make compliance easy.
Ready to Book?
Whether you’re managing a fleet or just need your RV tested before hitting the road, we’re ready to meet you where you are.
