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Linear regression analysis of incremental PM2.5 concentrations (concentrations above the outdoor levels) in the smoking areas of California casinos versus area smoking densities (n=31). Regression equation: PM2.5 concentration=8.3 × (area smoker density)+34.7 (R2=0.27; r=0.52). The star symbol represents the average incremental PM2.5 concentration for the average smoker density observed in seven Reno smoking casinos.
