Does volcanic ash pose hazards to human health?

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Does volcanic ash pose hazards to human health?

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Like airborne particles from dust storms, forest fires, and air pollution, volcanic ash is often small enough (less than 10 microns) to be inhaled deeply into the lungs. Thus, volcanic ash poses a health risk, especially to children, elderly people, and individuals with cardiac or respiratory ailments, such as asthma, chronic bronchitis, and emphysema.