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d="p0010">Size–segregated particles in 59 elderly residences of São Paulo were measured.
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d="p0015">The dominance of fine particles was found with PM2.5 contributing 78% of total PM10.
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d="p0020">Indoor sources dominated with I/O as 1.89 and 1.06 for PM2.5 and PM10, respectively.
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d="p0025">Respiratory deposition for PM2.5 was almost 25% higher in male than female elderly.
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d="p0030">Dominance of fine particles suggests control of indoor sources in elderly residences.
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