A smoke alert has been issued for parts of Karnup and Baldivis.
Motorists travelling along Paganoni Road and the Kwinana Freeway south of Karnup Road may be impacted.
The smoke is due to a Parks and Wildlife prescribed burn about 5km east of Secret Harbour.
"Smoke may settle in low lying areas overnight and is expected to clear Saturday morning," a DFES spokesperson said.
"Motorists are asked to drive to the conditions."
Nearby residents are advised to shut doors and windows and turn off air-conditioners.
Police issue 31,000 driving infringements in first month of new AI cameras
Works underway on Rockingham and Safety Bay High School redevelopments
New measles exposure sites revealed in Bunbury
Dawesville man charged after allegedly leaving his elderly Great Dane to suffer painful conditions
Good Samaritan sought by police after helping teen during robbery in Baldivis
Under-16s social media ban now in force
Desperate search continues for missing Bunbury FIFO worker
Passengers now able to use credit, debit cards to tag on and off WA's public transport
New floating jetty speeds up emergency response times for Marine Rescue Mandurah