What they call vog. this volcanic fog that's can be bad for your respiratory tract because it's got droplets of acid in it. when mauna loa erupted in 1984, the lava came within 8km of the city of hilo, but it's impossible to predict where it will go this time. wendy urquhart, bbc news. julia hammer is a volcanologist at the university of hawaii. she says scientists are able to monitor the eruption data very closely, allowing plenty of notice should people need to evacuate. it's been showing signs of unrest for about a month now and fortunately that gave the hazard managers and the us geologica...