| Business | Phone |
| Ace Smog Center 601 E Holt Blvd, Ontario 91761 | (909) 460-3090 |
| Hector's Smog Check 939 W State St, Ontario 91762 | (909) 460-9888 |
| Knc Gas Station 703 S Euclid Ave, Ontario 91762 | (909) 983-5556 |
| Ontario Mills Smog 1050 Ontario Mills Dr, Ontario 91764 | (909) 980-8877 |
| Thunderbolt Smog Svc 1141 W Holt Blvd, Ontario 91762 | (909) 983-6364 |