This type of treatment may be used in an emergency room for patients with acute, severe asthma.

The combination of helium and oxygen, known as heliox, reduces the density of the delivered gas, and has been shown to reduce the effort of breathing and improve ventilation when an airway obstruction is present.

depends on if you're using a NITROX mix or a HELIOX mix.

Depends on the depth, generally we use regular compressed air down to about 170 fsw but if below 170 fsw we would use a gas mixture of heliox (helium and oxygen)

The Noble of gas of helium (He) allows for the Goodyear Blimp (an airship) to rise. Helium (heliox) mixtures also allow for deep scuba diving.