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They were talking about how breathing the volcanic ash could affect the lungs.

No appreciable amounts of ash reached populated areas from recent volcanic bursts.

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Meanwhile, the volcano was steaming and the U.S. Geological Survey said magma continued to push into the crater of the volcano, adding to the lava dome.

Samples of lava collected last week show it is similar to the lava from the dome-building eruption that ended 18 years ago.