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What are the National Ambient Air Quality Standards for Carbon Monoxide?

April 26, 2017air quality Ambient carbon monoxide National Standards

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What are the National Ambient Air Quality Standards for Carbon Monoxide?

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There are two National Ambient Air Quality Standards (NAAQS) for CO. The 1-hour standard is 35 parts per million (ppm) and the 8-hour standard is 9 ppm. The CO standard which is most likely to be exceeded in the case of a parking facility is the 8-hour standard.