W94.2 - Exposure to rapid changes in air pressure during ascent W94 - Exposure to high and low air pressure and changes in air pressure W94.2 - Exposure to rapid changes in air pressure during ascent W94.21 - Exposure to reduction in atmospheric pressure while surfacing from deep-water diving W94.22 - Exposure to reduction in atmospheric pressure while surfacing from underground W94.23 - Exposure to sudden change in air pressure in aircraft during ascent W94.29 - Exposure to other rapid changes in air pressure during ascent