THE Department of Biodiversity, Conservation and Attractions has issued a smoke alert from Perth to Mandurah, including the Perth Hills.
The smoke is the result of several prescribed burns carried out by Parks and Wildlife Service, private landowners and local government over the past few days.
Smoke is expected to clear late tomorrow morning.
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.