Advanced life support and intensive care paramedics were called to Sydney Road about 3.20pm after hydrochloric acid spilled from containers on the back of a truck.

Paramedic Christine Frampton said her team found some of the containers had split, spraying acid onto a car travelling in the next lane.

"The 20-year-old, who was driving with her window half open, is extremely lucky the acid didn't come into direct contact with her skin.

"When you look at the car you can see where the acid has sprayed the driver's side door, the bonnet and the roof." The woman suffered a headache as well as a burning feeling at the back of her nose and throat.

"That suggested to us that she had inhaled some of the fumes," Ms Frampton said.

"That had the potential to cause breathing problems so we fitted her with an oxygen mask before taking her to the Northern Hospital in a stable condition."

Two paramedics who were first on the scene were also given a check-up as a precaution.