Emergency crews were called to at a container yard in Mississauga on Thursday.
Peel Regional Police say it appears that several transport trailers caught on fire near Torbram Road and Derry Road, just north of Pearson Airport.
The area was marred by thick black smoke and a foul odour, which authorities attributed to burning diesel.
Mississauga Fire and Emergency Services were called to the scene just before 5:30 p.m.
No injuries were reported.