Areca palm (Chrysalidocarpus lutescens)

• Works well in the day time
• Great for living areas
• One needs about 4 shoulder-high plants/person
• Needs to be put outdoors once every 3–4 months
• The leaves of the plant need to be wiped every day in Delhi and perhaps once a week in a cleaner city
• The soil used should be of vermi manure or use hydroponics

Mother-in-law's tongue (Sansevieria trifasciata)

• Converts CO₂ into O₂ at night
• One requires about 6–8 such waist-high plants per person in the bedroom
• Leaves need to be wiped in the same way as the Areca Palm
• The soil used should be of vermi manure or use hydroponics

Money plant (Epipremnum aureum)

• Excellent for removing formaldehyde and other volatile organic compounds
• Best grown using hydroponics

Meattle does not provide any numerical data to support his claims, ^[3] nor is there third-party confirmation of the results, but at least one study calls the hypothesis into question. ^[4]