Related by context. Frequent words. (Click for all words.) 51 Kilauea 48 volcanic activity 48 volcano 48 lava flows 47 volcanic ash 46 ash clouds 46 particulates 45 toxic gases 45 ash 45 volcanic eruptions 44 sulfur dioxide 44 toxic fumes 44 particulate matter 44 ash plume 44 radioactive particles 43 ash cloud 43 smog 43 ozone 43 smoke 43 hydrogen sulfide 42 haze 42 volcanic eruption 42 radioactivity 42 cigarette smoke 42 volcanic 42 respiratory illnesses 42 carbon monoxide 41 volcanoes 41 acid rain 41 soot 41 heavy rainfall 41 Merapi 41 El Niño 41 eruptions 41 lava 40 secondhand smoke 40 radiation 40 active volcanoes 40 water vapor 40 typhoons 40 plume 39 tsunamis 39 ultraviolet radiation 39 seismic activity 39 rainstorms 39 Mount Merapi 39 storms 39 pollen 39 rip currents 39 algae blooms 39 eruption 39 turbidity 38 dust particles 38 Japan Meteorological Agency 38 UV radiation 38 La Niña 38 air pollution 38 particulate 38 rainfalls 38 Volcanology 38 Santa Ana winds 38 respiratory ailments 38 dense fog 38 plumes 38 quakes 38 UV rays 38 asbestos fibers 38 algae bloom 38 mist 37 gusts 37 temblors 37 Radiation 37 Honshu 37 respiratory illness 37 El Nino 37 electromagnetic radiation 37 drifting snow 37 tropical cyclones 37 fumes 37 pollutants 37 typhoon 37 earthquakes 37 radon 37 Smog 37 rainfall 37 radioactive contamination 37 heavy rains 37 La Nina 37 clouds 37 fog 36 winds 36 cloudiness 36 volcanos 36 ozone pollution 36 lava dome 36 wind gusts 36 volcanic ash cloud 36 rains 36 radiation leaks 36 thunderstorms 36 warmer temperatures