Morwell residents are increasingly concerned and angry about the thick smoke and air pollution that have blanketed the town for more than two weeks and plan to take to the streets to protest.

The rally, to be held on Sunday at the Kernot Hall, comes as health authorities receive advice from international experts on potential health effects of the black smoke and ash affecting Morwell since a fire spread into the Hazelwood open cut coalmine on February 9.

Morwell residents have complained about inadequate information and, worried about their health, have attended a health assessment centre established in Morwell which is providing free health checks for residents.

"He's just told me to wear a mask because my nose won't stop bleeding," said one woman after attending an assessment clinic.

"I'm here because my chest is burning," said another.