As firefighters prepare for more challenging conditions at the Hazelwood fire, crowds of people have rallied in Morwell and directed anger at the mine's owner for the smoke and ash that continues to infiltrate their homes.

The fire has been burning since February 9, when a deliberately lit fire spotted into the Hazelwood open-cut mine.

Where there's smoke: the Morwell protest march. Credit:Michael Clayton-Jones

Warm and dry weather forecast for Tuesday could increase fire activity at the coalmine. But Fire Services Commissioner Craig Lapsley said the size of the fire had been reduced substantially after favourable conditions on the weekend.