.
Otherwise, there are a number of air purifiers in the market that can filter the poor environment.
You will likely need to have a pulse oximeter on hand so you can measure your oxygen saturation periodically.
Let me tell you for your information, it is quite possible that there are so many techniques using which you can check your oxygen level without an oximeter.
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Although we all breathe oxygen, medical oxygen is highly concentrated and qualifies as a medical substance.