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"At lunchtime two Fridays ago, 30 young adults wearing dust masks gamboled into Market Square. Festive at first, trading high-fives, seconds later they began coughing convulsively."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.pghcitypaper.com/pittsburgh/clearing-the-air-just-because-you-cant-see-pollution-doesnt-mean-it-cant-hurt-you/Content?oid=1554322>