Emissions Limits for 1981 and Older Light-Duty Vehicles
1981 and older vehicles are tested with the two-speed idle test. Pollutants are sampled and measured in parts per million. Oxides of nitrogen are not measured in the idle test.
1981 & Older Light-Duty Passenger Vehicle Limits
(Includes Light-Duty Trucks)
|1970 & Earlier||3.5||1000|
|1981 & Newer||1.2||220|
CO: carbon monoxide HC: hydrocarbons
Source: Colorado Department of Public Health and Environment