Photos from the scene showed burning lava flows and vivid red skies.
The USGS said in its latest update on Monday afternoon that only one of the three fissures — cracks in the earth where lava flows from — was still active.
It said that lava was still flowing and that more fissures could be created, but that there was no risk to people's property.
The Hawaii Department of Health warned, however, that air quality could be impacted, as the volcano could create volcanic smog, "ash in the air, [with] levels of sulfur dioxide to increase and fluctuate in various areas of the state."
The USGS said that the volcano last erupted in 1984, and that it rises 13,100 ft above sea level.
It also said that it's the largest active volcano on the planet, and among the most active.
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