Cannot count on the logical places to have a air pressure supply and a consistently working one at that. be smart and get yourself a auto air compressor at any car accessories shop. Hooks up to your battery and a good one will set you back no more than QR250.
Also know that this gives you the ability to measure true cold pressure at home before you drive the way it should be done. Even driving 1 km to your nearest petrol station can raise the pressure in your tires which you dont want before you measure them.