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In this post: Visible air contaminants What are invisible air contaminants? How to protect your indoor air Shared from Surgically Clean Air. What's in the Air We Breathe? It's free, it’s all around us outdoors and indoors. We can’t live without it for more than a few minutes. But we often take the air we breathe for granted. The air you breathe is made up of lots of things besides oxygen! Oxygen only makes up about 21% of air. About 78% of the air you breathe is made up …