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Previous Volume 344:1253-1254 April 19, 2001 Number 16 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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To the Editor: Samet et al. (Dec. 14 issue)¹ provide compelling, additional evidence of the link between outdoor air pollution — respirable particulate matter less than 10 µm in aerodynamic diameter (PM₁₀), in particular — and mortality. One perplexing finding, however, is the observed associations between outdoor ozone levels and mortality. These were marginally significant and positive during the summer but significant and negative during the winter. The authors suggest that the associations in the summer may reflect the higher levels of ozone during these months, but they fail to address the significance of the negative associations in the . . . [Full Text of this Article]

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