Fumes of the Kilauea Iki crater on Big Island, Hawaii.
We drove to the top of the Mauna Loa volcano in a bus, most of the activity was fume (including toxic sulfur dioxid) but most of it was water vapor as rain reached the hot underground. This is one of the best view I could have of the volcano at Kilauea Iki. We didn't see the active lava flow unfortunately.
