How to grow a fresh air? What are plants? They are: areca yellowish (Chrysalidocarpus lutescens), Sansevieria trifasciata (Sansevieria trifasciata) along with epipremnum gold (Epipremnum aureum). Areka yellowish removes CARBON in city and switches it into oxygen. For one person you will need four shoulder-high plants to be grown hydroponically or upon biohumusie. The device must be properly nurtured: wipe at least once a week and expose out every three or four months. Sansevieria (coil) is named. plant bedroom as switches CO2 into oxygen at night. For one person need 6 to 8 waist-high pieces. The third plant will be epipremnum gold, which is best grown hydroponically. This unique plant removes formaldehyde and other volatile chemicals.