A smoke alert has been issued for Byford and surrounds in the Shire of Serpentine Jarrahdale.
The smoke is a result of a prescribed burn being carried out today by the Parks and Wildlife Service and is expected to clear overnight.
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.