HSE Surface Supplied Diver Practice Questions - HSE Surface Supplied Diver Qualification (UK Health And Safety Executive) Exam

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Under British Standard BS EN 12021 for breathing air quality, what is the maximum allowable concentration of carbon monoxide (CO) in compressed breathing air supplied to a diver?

15 ppm 5 ppm 50 ppm 25 ppm

Correct Answer:

5 ppm

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