The Parks and Wildlife Service has issued a smoke alert for Dwellingup and surrounds including Lane Poole Reserve in the Shire of Murray.
The smoke is the result of a prescribed burn being carried out by the service and may persist in the area for several days.
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 in these areas.
People with asthma and pre-existing respiratory or cardiovascular illnesses should follow their pre-prepared treatment plan.
Those with conditions exacerbated by smoke should take precautions in line with their medical advice.
Visit emergency.wa.gov.au for further information.