Idle emissions for a properly functioning vehicle? Oh, I don't know - for gasoline-fueled engines only, let's say anywhere from:

300 HC/4.5% CO/12.5% CO2/200 NOx on a 1955 Jaguar XK120

to around

7 HC/0.00 CO/14.8% CO2/0 NOx on a 2008 Honda Civic.

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