Anything above 400 PPM and below 1300 PPM is ideal for cannabis cultivation. At night, plant transpiration can increase co2 levels beyond ideal levels. Make sure that lights off co2 levels stay below 500 PPM. If the levels increase, use an inline fan and carbon filter to exhaust the excess co2 out of the growing environment.
What Co2 Levels should I have with the Lights On?
Updated on December 11, 2019