The last eruption happened in 1990. If the volcano erupts, it could shoot an ash cloud 50,000 feet into the jet stream. The ash could shroud several cities, including Anchorage, which is about 100 miles northeast of Mount Redoubt.
Particulate released during an eruption has jagged edges and can injure skin, eyes and breathing passages. It can also hamper engines.
A warning from scientists about the increase in earthquake activity under the volcano and imminent eruption has residents buying dust masks and car air filters.
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