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To assess particle oxidative potential in the greater Beirut area, size-resolved PM 10–2.5 , PM 2.5–0.25 and PM 0.25 samples were collected at near-freeway and urban background sites. Metals and trace elements, including Mn, Cr, Cu, Ba, Mo and Sb, displayed increased levels and crustal enrichment factors at the roadway, indicating their vehicular origin. These elements in addition...
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