The air quality in the passenger cabins of DC-9 and MD-80 aircraft has been studied on 48 representative flights. A portable air sampling case was used. No observations of health effects were made. The average levels of the components related to environmental tobacco smoke, were for respirable suspended particles 60, 250, 160 and 220 g/m 3 ; for nicotine 5, 41, 21 and 32 g/m 3 ; and for carbon monoxide 0.6, 1.1, 0.8 and 1.
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