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Spectrum concentration difference between the inside and the outside

In general, the oxygen concentration, measured indoors, 20.5% on average is 30 minutes after the breakdown of the space. The concentration of oxygen in air is, from 20.8% to 20.9%. Given this difference of 0.3% to 0.4% between the concentration of oxygen inside and outside, the reason for which we feel refreshed on the outside is due to the difference in oxygen rather than the temperature difference.

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