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https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/8765475

Driver Holding His Car's Test Card as It Proceeds Along the Safety Lane During a Checkup at an Auto Emission Inspection Station in Downtown Cincinnati, Ohio. Since January, 1975, All Vehicles in the City Are Being Checked Once a Year on Safety Requirements Previously They Were Tested Semi-Annually.

the Change Was Made Because of the Addition of Carbon Monoxide and Hydrocarbon Emissions Testing on Light Duty, Spark Ignition Powered Motor Vehicles 09/1975. Photographer: Eiler, Lyntha Scott. Original public domain image from Flickr

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Driver Holding His Car's Test Card as It Proceeds Along the Safety Lane During a Checkup at an Auto Emission Inspection Station in Downtown Cincinnati, Ohio. Since January, 1975, All Vehicles in the City Are Being Checked Once a Year on Safety Requirements Previously They Were Tested Semi-Annually.

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