Re: What are the highest oxygen producing plants that can live inside

That does not seem like a viable idea because photosynthesis in a typical house
will not significantly raise the oxygen level. Both the number of plants in a
house and indoor light levels are not high enough to raise the oxygen level
much, if at all. 

Many houseplants grow very slowly because the indoor light level is not much
above the light compensation point. The light compensation point is the light
level at which a leaf consumes the same amount of carbon dioxide in
photosynthesis as it produces via cellular respiration.  

Even in a sunny greenhouse packed with plants, where photosynthesis is high, the
oxygen level will not rise significantly above outside levels because the
greenhouse has to be vented to provide carbon dioxide required for
photosynthesis. In an airtight greenhouse, the limited supply of carbon dioxide
is quickly depleted by photosynthesis. The rate of net photosynthesis then goes
to zero.

A related urban myth is that indoor plants at night will reduce the oxygen level
and suffocate people sleeping there. Again, there is not a large enough mass of
indoor plants to significantly reduce the oxygen level at night due to their
cellular respiration. In addition, houses are not airtight so oxygen can enter
from outside.


Reference


Re: Do plants use oxygen?