The best replacement for fresh air is recirculated air.

The best alternatives to fresh air are rated as following:
★★★★★  recirculated air
★★  exhaust
★  recirculate

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Speaking about fresh air, one probably shouldn't forget about terry gross.

Other search terms related to fresh air and their ratings are:
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★ teri gross
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★ gross
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Google Trends

Scale is based on the average worldwide traffic of fresh air in all years. Click on graph for more.
fresh air
recirculated air
exhaust