VIEW OF AN EXHAUST ANALYZER AT AN AUTO EMISSION INSPECTION STATION IN NORWOOD, OHIO. REGULATIONS SPECIFY THE MAXIMUM LIMITS OF CARBON MONOXIDE AND HYDROCARBON EMISSIONS PERMISSIBLE FOR VARIOUS YEARS OF VEHICLES. TOP LIMITS OF CO FOR AUTOS ARE 6%%%%%%%% FOR PRE-1968 MODELS, 5%%%%%%%% FOR 1968-69, 4%%%%%%%% FOR 1970-74 AND FOR 1975 MODELS HC LIMITS FOR CARS ARE 1,000 PARTS PER MILLION FOR PRE-1968 MODELS, 600 PPM FOR 1968-69, 500 PPM FOR 1970-74 AND 250 PPM FOR 1975 MODELS

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