eli5 fresh air vs recirculated air?

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What makes fresh air more ‘fresh’ and what makes indoor air feel ‘stale’?

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Anonymous 0 Comments

There’s a few types of air but In short 

Air isn’t just gases it’s also a bunch of dust and particles flying around. If you don’t replace the air regularly those particles can become excessive and make the air feel stale. 

Fresh air has a lot less of these particles which makes it easier to breath and less smelly.

On a side note;

Dead air is air that’s been sitting a while, usually completely isolated from fresh air. This is dangerous as build up of carbon dioxide, dust and other chemicals can make the air unbreathable. This is usually a problem in confined spaces, such as old under ground bunkers and caves. 

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