"...“There's no federal safety standard on it, so it’s a real problem,” reports Bob Williamson, president of the San Francisco chapter of the American Postal Workers Union (APWU). “We’ve had people who have developed occupational asthma from breathing the fine dust.” Other reported problems include bronchitis, allergic reactions, migraines, bacterial infections, conjunctivitis and sore throats. ..." 
Source: www.healthnewsdigest.com
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