1974-02-01

Cold Ambient Temperature Effects on Emissions from Light-Duty Motor Vehicles 741051

An emission testing program conducted at Ottawa, Canada, indicated that the start-up and operation of light-duty motors at an ambient temperature of 0°F produces approximately a 100% increase in hydrocarbon and carbon monoxide emissions when compared with those produced at an ambient temperature of 60°F. This increase appeared to occur mainly during the initial 5 min of engine operation.

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