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About 60 per cent of the country’s pollution in the mid-1960s came from cars. The Environmental Protection Agency (EPA) has implemented a variety of regulations to combat this and other types of pollution, most notably the Clean Air Act in 1970 and a later amendment mandating the American auto sector to reduce vehicle emissions significantly. Vehicle emissions have dropped by almost 75% since then. Please see QLD Catalytic Converters if you have any issues with this critical component. Your vehicle’s efficiency and environmental friendliness might benefit from routine maintenance on the catalytic converter.