Fire and Rescue NSW (FRNSW) and Rural Fire Service (RFS) crews battled explosions and large blaze in a vehicle scrap yard at Trenayr, north of Grafton on Monday.
More than 15 fire trucks responded to the emergency in Trenayr Road, just before 6pm on Monday evening.
The fire took hold in rows of scrapped cars, stacked up to ten vehicles high, and sent a large plume of black, toxic smoke into the sky.
A firefighter received a head injury whilst fighting the blaze. She was admitted to hospital for observation and released.
NSW Police and NSW Ambulance crews also attended the emergency.
Firefighters gained control of the blaze by 9pm and remained at the scene to monitor hot spots.
The cause of the fire is under investigation by NSW Police.