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The acidic and alkaline substances of indoor and outdoor PM10 aerosol samples were collected simultaneously in 15 domestic environments in the Taipei urban area; 10% of indoor and 20% of outdoor PM10 levels exceeded the USEPA 24 h standard for PM10 (150 μg m -3 ). The mean indoor concentrations of Na + , K + , NH +4 , Cl - , SO 2-4 ...
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