Figure 2From: Particulate matter (PM) 2.5 levels in ETS emissions of a Marlboro Red cigarette in comparison to the 3R4F reference cigarette under open- and closed-door condition Boxplots of ETS exposure; emission period. a) AUC-PM2.5; b) Cmean-PM2.5 for 3R4F and Marlboro Red cigarettes; data were analyzed under open- and closed-door conditions.Back to article page