As the vehicle moves, it pushes the air to make way for its motion.For those interested, the pressure difference may be up to 0.5 inH2O at freeway speeds. The surface pressure is higher at the rear of the vehicle than the internal cabin.When a vehicle is in motion, a pressure differential occurs between the exterior rear and the cabin. Obstructions such as snow or debris can redirect the emissions back into the vehicle.Ĭarbon Monoxide Entering with HVAC in Recirculation Mode Neighboring station vehicle emits pollution and is drawn directly into the cabin.In this case, exhaust gas and carbon monoxide does not dilute with the outdoor environment and can be drawn into the vehicle cabin. Parked and engine is on in a quasi indoor environment with poor ventilation such as a parking structure, garage, or home garage.Downwind direction from exhaust to HVAC intake can draw exhaust gas into the cabin. If the vehicle is stationary is may draw in polluted air. Dangerous scenarios when stationary include: Air may be sucked into the vehicle by the blower - intake is usually passenger side under the windscreen. Polluted air may enter the vehicle via the HVAC system in fresh air mode. carbon monoxide accumulates in a quasi indoor environment such as a parking structure or garage and is drawn into the cabin via the fresh intake ventĬarbon Monoxide Entering with HVAC Fresh Air Mode Stationary.carbon monoxide leaks from the exhaust, exhaust manifold and engine bay.the outdoor air contains carbon monoxide due to heavy traffic or a polluted vehicle in the direct path of yours.
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