Reviews of daily time-ries mortality sudies from many cities throughout the world sugest that daily mortality counts are asociated with short-term changes in particuia±e matter (PM) air pollution. One U.S. city, however, with conspicuously weak PM-mortality asociations was Salt Lake City, Utah; however, relatively robust PM-mortality asoiations have been observd in a neighborig metropolitan area (Provo/Orem, Utah). The present study eplored this apparent discrepancy by collectng compng and ing

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... ortality, pollution, and weather data for all three metropolitan areas on Utah's Wasatch Front region of the Wasatch Mountain Range (Ogden, Salt lake City, and Provo/Orem) for approximatdy 10 years (1985)(1986)(1987)(1988)(1989)(1990)(1991)(1992)(1993)(1994)(1995). Generlized additive Poisson regression models were usd to estimte PM-mortality associations while controlling for nality, temperae, humidity, and barmetric pressure. Sal ake City eperienced s ally more episodes of high PM that were dominated by windblown dust When the data were screened to exclude obvious windblown dust episodes and when PM data from multiple mosntors were used to construct an estimate ofmean exposure for the area, compble PM-mortality effects were esmt Afer screening and by using cons mean PM . 10 pm in aeroynmic diameter (PM1,) data, the estiated percent change in mortality associated with a 10-mg/m3 incrase in PM,0 (and 95% confidence intervals) for the three Wastch Front