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What is the primary standard level for carbon monoxide for assuring air quality?

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+1 vote
in Environmental Engineering by (81.4k points)
What is the primary standard level for carbon monoxide for assuring air quality?

(a) 10ppm

(b) 90ppm

(c) 1ppm

(d) 9ppm

This question was addressed to me in unit test.

This intriguing question originated from Air Pollution in division Air Pollution of Environmental Engineering

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+2 votes
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Best answer
Right option is (d) 9ppm

To explain: The primary standard level for carbon monoxide is 9ppm.

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