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A campaign was conducted to assess and compare the air quality at the different metro platforms at Shanghai City, focusing on particulate matter (PM) levels, chemical compositions, morphology and mineralogy, as well as species of iron. Our results indicated that the average PM2.5 concentrations for the three metro lines were 177.7μg/m3, 105.7μg/m3 and 82.5μg/m3, respectively, and the average PM1 concentrations...
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