The president promised federal assistance to the states in fighting the blazes, saying there were already 3,000 firefighters working nationwide.
With dense smoke drifting across a wide swath of Brazil -- even reaching capital city Brasilia 720 kilometers (450 miles) to the north -- several flights have been canceled and travel on some roads has been halted.
"I stuck my nose out last night around 7:00 pm and I had a lot of trouble breathing," 66-year-old retiree Carlos Rodrigues told AFP. "I've lived here 32 years and I've never seen anything like it."
Two factory workers died Friday in Urupes, in the northern part of the state, while fighting a fire, officials said.