translate English to French: While extremely unlikely, the potential consequences of large scale releases of CH4 and H S associated with 2 blowouts are of major concern as they could have health and safety consequences for platform workers and passengers of vessels within several kilometres downwind.
À des concentrations de 1 à 10 ppm, il y une forte odeur, et les personnes exposées pourraient souffrir de nausée ou de maux de tête, ou avoir des larmes aux yeux.