A smoke alert has been issued for Bunbury, Collie, Donnybrook, Worsley, Burekup and Binningup areas.
The Parks and Wildlife Service at the Department of Biodiversity, Conservation and Attractions has issued the warning as prescribed burns have been taking place.
It is expected to dissipate tomorrow.
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.
KEEP UP TO DATE:
Visit www.emergency.wa.gov.au, call 13 DFES (13 3337), follow DFES on Twitter: https://twitter.com/dfes_wa, Facebook: https://facebook.com/dfeswa/, listen to ABC Local Radio or listen to news bulletins.