this study estimated the association between particulate air pollution and daily mortality in utah valley using the synoptic climatological approach to control for potential weather effects . 
 this approach was compared with alternative weather modeling approaches . although seasonality explained a significant amount of variability in mortality , other weather variables explained only a very small amount of additional variability in mortality . the synoptic climatological approach performed as well or slightly better than alternative approaches to controlling for weather . however , the estimated effect of particulate pollution on mortality was mostly unchanged or slightly larger when synoptic categories were used to control for weather . 
 furthermore , the shape of the estimated dose - response relationship was similar when alternative approaches to controlling for weather were used . 
 the associations between particulate pollution and daily mortality were not significantly different from a linear exposure - response relationship that extends throughout the full observed range of pollution.imagesfigure 1.figure 2 . 
 afigure 2 . 
 bfigure 2 . 
 cfigure 2 . 
 d