text: The Alternative Estimate of the impact of fine particle reductions on premature mortality relies on recent scientific studies finding an association between increased mortality and short-term ( days to weeks ) exposure to particulate matter , while the Base Estimate relies on a recent reanalysis of earlier studies that found associations between long-term exposure to fine particles and increased mortality .
  
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  The Alternative Estimate of the impact of fine particle reductions on premature mortality was reported on .