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Air quality flags

04/01/2015 10:11 PM
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A four-color system of air quality alert flags are displayed at a press conference in Yunlin County Wednesday, ahead of the system's launch in elementary and high schools the following day. The green flag on the right means air quality is OK, with the yellow and red ones denoting progressively worse levels of pollutants and the purple one on the left denoting hazardous air quality. CNA photo April 1, 2015


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