Watch it! Dyslexic Driver Transporting Gas.

Pray, what is this dengarous "Medical Gas" this guy is transporting? The collective flatulence of medical professionals?

And where is this gas needed? What is the purpose?

Is there a surfeit of this gas somewhere from where it is exported? Some hospital cafeteria that serves just beans to the doctors and nurses?

I am curious as to how the gas is collected and pressurized. Do the donors line up when logging off their shifts? Each person bends down after doffing his/her attire and proffers his/her posterior to a receptacle, which then proceeds to suck out the gaseous offering. Is it deodorized? If yes, where and how are the odours disposed off?

Are eructations also accepted?

Or this is just oxygen?