Incandescence is visible at night at Halema`uma`u crater at Kilauea summit. Small amounts of lava are being emitted from the vent, and ash emissions are visible during the day. On March 29 sulphur dioxide levels at the summit were 730 tonnes/day, compared to background levels of 150-200 tonnes/day. Sulphur dioxide emission rate increases from this level when ash emissions occur at the vent.
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