Unknown substance thrown at Brisbane bus driver

A bus driver in Brisbane's south has been rushed to hospital this morning after an unknown substance was thrown at him.

Queensland Police say the substance may have been thrown through the driver side window of the bus on Drew Road in in Loganholme around 9.30am today.

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The male driver was treated at the scene before being transported to Princess Alexandra Hospital in a stable condition.

A spokesperson for Queensland Ambulance told 9news.com.au the patient suffered irritation to his face, similar to substance burns.

Police have urged anyone who was driving in the area to come forward with information.

"Any members of the public who have dashcam vision or CCTV in and around Drews Road and Jalan Street between 9am and 10am are urged to contact police immediately," Queensland Police said in a statement.

"If you have information for police, contact Policelink by providing information using the online suspicious activity form 24hrs per day at www.police.qld.gov.au/reporting.

"You can report information about crime anonymously to Crime Stoppers, a registered charity and community volunteer organisation, via crimestoppersqld.com.au 24hrs per day."