The objective of this study was to make a preliminary investigation of the relative amounts of exhaust gases inducted into the passenger compartment of a vehicle by the forced ventilation system when the vehicle is operating in city traffic. Two basic driving conditions are representative of 'stop and go' city traffic patterns; first, low speed operation with slow cruise, mild accelerations and mild decelerations; and second, stationary operation at idle with the vehicles grouped with minimal interval between vehicles as if stopped at a traffic light or in a traffic tie-up. Under heavy traffic conditions, when the effect of inducted exhaust gases in the passenger compartment is greatest, traffic conditions generally result in a minimum of two cars abreast.

"February 1961."