Pressure Transducer Calibration: Gasses

We are looking into other gasses to use for a PT Calibration, instead of Nitrogen. Our main issue with nitrogen is accessibility for our area and status. I have seen that Argon would be a good gas to use, but haven't found many SOP's or research into it. I have also been recommended Oxygen, but have safety concerns regarding Oxygen use. Any information would be greatly appreciated!