The Department of Parks and Wildlife has issued a smoke alert for Bunbury to Margaret River, including Donnybrook.
Smoke will be visible until late morning tomorrow.
The smoke is the result of a number of prescribed burns being carried out in the South West today.
WHAT TO DO:
If the smoke is particularly thick, it is recommended people shut doors and windows and turn off air-conditioners.
Smoke may reduce visibility on some roads and motorists should take care, turn on headlights and travel at appropriate speeds when travelling in these areas.
People with asthma and pre-existing respiratory or cardiovascular illnesses should follow their pre-prepared treatment plan.
People with conditions exacerbated by smoke should take precautions in line with their medical advice for these circumstances.