Twenty firefighters injured as NSW burns

By AAP Newswire

Doctors and paramedics on the ground have treated more than 100 people hurt during NSW's devastating bushfires, 20 of them firefighters injured trying to protect communities.

NSW on Tuesday declared a state of emergency for seven days, with the danger considered "catastrophic" for the Greater Sydney and Hunter regions and "severe and extreme" across large tracts of the rest of the state.

NSW Ambulance Commissioner Dominic Morgan is considering bringing in extra resources from interstate.

"Over the last few days our doctors and paramedics have been exceedingly busy; they've treated over 100 patients for fire-related activity," he told reporters in Sydney on Monday.

"We had a whole range of things that have been confirmed from very severe burns, sadly resulting in a loss of life in some instances, right down to minor injuries and minor burns."

Mr Morgan paid tribute to the firefighters his teams had treated who were injured in the line of duty.

"That's something that we should all be recognising," he said.

"Up to 20 (of the people treated) have been directly related to firefighters being injured while protecting their own communities."

Mr Morgan said 30 additional ambulance crews would be deployed across the state to ensure additional protection as well as extra air assets.