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Comment by crazygringo

The more we study it, the more we learn how harmful the air inside our homes is.

That's why fresh air is key. Crack a window or two open. Buy an air monitor that monitors CO2 (good proxy for overall freshness), VOCs (sometimes these build up much faster than CO2), and PM2.5.

If CO2 or VOCs are high, open windows more. If PM2.5 is high and coming from outdoors, turn on an air filter.

Yes, this means your heating and cooling bill will be a bit higher. But for your health and concentration, it's worth it.

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