https://phys.org/news/2018-05-toxic-cloud-hawaii-volcano-lava.html

Further upslope, lava continued gushing out of large cracks in the ground in residential neighborhoods in a rural part of the Big Island. The molten rock made rivers that bisected forests and farms as it meandered toward the coast.

The rate of sulfur dioxide gas shooting from the ground fissures tripled, leading Hawaii County to repeat warnings about air quality. At the volcano's summit, two explosive eruptions unleashed clouds of ash. Winds carried much of it toward the southwest.