Sub-paragraph 2: Composition of gases

Without prejudice to the occupational exposure limit values laid down in articles R. 4222-10, R. 4412-149 and R. 4412-150, the air or mixtures breathed during work must have the following characteristics: 1° In the case of carbon dioxide, a partial pressure of less than 10 hectopascals ; 2° In the case of carbon monoxide, a partial pressure of less than 0.05 hectopascals; 3° In the case of water vapour, for…

The partial pressure of nitrogen in a breathing mixture must be less than 5,600 hectopascals.

The partial pressure of oxygen in a breathed mixture must not : I. – Be less than 160 hectopascals and, in a hyperbaric work chamber, be greater than 25 per cent of the absolute pressure. II – Exceed the following values: 1° During periods of physical activity, outside the compression and decompression phases and for continuous periods of exposure not exceeding 3, 4, 5, 6 and 8 hours respectively: 1,600…

By way of derogation from I of Article R. 4461-19, breathing pure oxygen under pressure with a personal respirator is authorised during decompression periods in accordance with the decompression procedures defined in 6° of Article R. 4461-6.