CLOSEUP OF AN EXHAUST ANALYZER USED AT AN AUTO EMISSION INSPECTION STATION IN DOWNTOWN CINCINNATI, OHIO. A CITY EMPLOYEE IN THE BACKGROUND IS HOLDING THE HOSE WHICH RUNS FROM THE CAR'S TAILPIPE TO THE MACHINE WHICH REGISTERS CARBON MONOXIDE AND HYDROCARBON EMISSIONS. EXHAUST EMISSION TESTS WERE STARTED ON AN ANNUAL BASIS IN JANUARY, 1975, FOR ALL LIGHT DUTY, SPARK IGNITION POWERED MOTOR VEHICLES. ALL VEHICLES REGISTERED IN THE CITY UNDERGO ANNUAL SAFETY CHECKS

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