| Business | Phone |
| Alosta Smog Check 1027 E Route 66 # A, Glendora 91740 | (626) 335-9538 |
| Glendora Smog Test Only Center 512 W Route 66 # B, Glendora 91740 | (626) 914-9404 |
| Glendora Test Only & Smog 857 E Arrow Hwy, Glendora 91740 | (626) 857-4700 |
| Samo's Smog Check 103 E Arrow Hwy # A, Glendora 91740 | (626) 914-2347 |
| Smog Shop 252 S Glendora Ave, Glendora 91741 | (626) 335-5258 |
| Test Only Center 407 W Arrow Hwy, Glendora 91740 | (626) 335-6683 |