I originally setup my darkroom with a remote compressor with a filtered and regulated outlet near my enlarger.
But a few years ago I bought a tank of Nitrogen and regulated it down to about 10 psi with a hose and "blow gun" adapter. Now I can blow away dust, and give a squirt into opened bottles of chemistry. In over a year, I have not yet refilled the Nitrogen tank.
I heard that also, that the Nitrogen can be used. I have been thinking of getting set up this way for chemical storage anyway, so good idea.