'Lava haze' and 'vog': toxic volcanic gases prompt health fears in Hawaii

Potentially deadly plumes of volcanic gas and particles are polluting the Big Island in the wake of recent eruptions

Three dozen tourists were gathered at the Wailoa Sampan Basin Harbor in Hilo, Hawaii, hoping to get a glimpse of the lava that they'd seen on the news for weeks.

But because Hawaii Volcanoes national park - often a key stop in travelers' itineraries - was closed after Kilauea erupted, their best hope on Monday afternoon was taking a boat to the point where the lava met the sea.