While the work is being carried out, ventilation is provided in accordance with the requirements of article R. 4222-6 or R. 4222-11, depending on whether the work is being carried out in a non-specific pollution area or a specific pollution area, in such a way as to maintain a healthy atmosphere and ensure that the air is constantly swept, without prejudice, in the case of underground work, to the provisions of articles R. 4534-43 to R. 4534-49.