What is “fresh air”? Is air not just air?
In: Earth Science
If something is pure air, then yes air would just be air. Pure air is usually defined as nitrogen and oxygen with perhaps a few other things like argon and carbon dioxide in low quantities.
But in the real world, there can be many other particles floating around in what we might call “air” just like a real world glass of water might have many other substances in it besides H2O.
Air in your house could have a number of dust particles and pollutants in it that have come from biological sources (you) as well as the materials your house is made of.
Air outside might be fresher (closer to pure air) since the outside air is a much larger quantity of air to dilute pollutants.
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