Figure 4From: 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 Climate parameters during ETS measurement - temperature. a) indoor temperature; b) outdoor temperature; red: Marlboro Red; blue: 3R4F reference cigarettes; values are averages for the total time interval.Back to article page