Oh wait nvm.. i searched for it, so yea, plant do release Carbon dioxide but the amount is very small, so even if you fill your room with plants, you will not get poisoned by it.
Also, other than photosynthesis, plant also do respiration, so during the daytime, the rate of photosynthesis is higher than respiration and it's the opposite in the nighttime..
Well, please correct me if I am wrong cause I am actually not really sure haha ╮( ̄▽ ̄)╭
You can keep plants inside, you just need to know if they are for sun (so you can place them near a window) or shadow and how much water they need. It's better if you water them either very early in the morning or at night mostly on hot months of the year so they get the best of the nutrients in the water.
Some of them are even good to keep bugs away (like lavender or romemary)
Also is recomended not to put then on de room you sleep (except cactus, those are good companions ;))
This is a thread i did not expect to find on mangago but im here and i love it.
To add tonthe discussion tho, its very important to to keep windows open not because the plant will release co2 that might poison people but to make sure the plants get the right amount of air. I learned this the hard way with my cactus.
Hey, I know this is not where I am supposed to ask but.. Is that okay to keep plant indoor like that? Won't you like.. get suffocated at evening? I mean.. plant release Carbon dioxide at evening right?