VirialCoefficientB

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VirialCoefficientB3 karma

It depends on the mask and conditions. For the SO2 and stuff you need chemical cartridges and you need oxygen. Particulate filters won't help. Given possible oxygen displacement and unknown concentration of nasties, I'd probably go with a full face self contained breathing apparatus. Doubt many are doing that.

VirialCoefficientB1 karma

If the oxygen concentration gets dangerously low due to volcano emissions, you are dead anyway.

You should look up a SCBA or self contained breathing apparatus. Then try again.

This is a concern if you have [anything that displaces oxygen]

FTFY