Fig. 3From: A tensor product quasi-Poisson model for estimating health effects of multiple ambient pollutants on mortalityMortality rate ratio (RR), estimated by models I-IV, for various levels of air pollution relative to the reference level. a-c show the exposure-response curves for PM10, NO2 and SO2, respectively, given the levels of other two pollutants fixed as their 25th percentiles. d shows the combined rate ratio (RRc) associated with the simultaneous increases in the levels of three pollutants. The horizontal lines in (a-d) indicate RR is equal to 1Back to article page