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Residents wearing surgical facemasks walk by in Argentina's Patagonian city of Esquel May 5, 2008. On Friday, in nearby Chile's Chaiten volcano erupted, forming a mushroom cloud as ash shot high into the sky.

A man rides a bicycle wearing a surgical facemask in Argentina's Patagonian city of Esquel May 5, 2008. On Friday, in nearby Chile's Chaiten volcano erupted, forming a mushroom cloud as ash shot high into the sky.
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