Co2 and fresh air

if your growroom has an adequate supply of fresh, outside air, would co2 be a worthwhile investment, or does fresh air from outside contain enough for extra to be unneccessary?

0.033% approx global average

thank you for the statistic there, but could you please elaborate as to how that relates to my dead question....btw, thank you for allowing my thread to be your first post

gogrow said:

thank you for the statistic there, but could you please elaborate as to how that relates to my dead question....btw, thank you for allowing my thread to be your first post

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outside is air good enough.

Plenty of fresh air is great,"but" if you are going to use co2 you will need to close the area(no ventilation) for the saturation time.So fresh air is fine,co2 is faster.