Kamal Meattle (an activist) says how he recovered from the Delhi’s polluted air which reduced his lunge capacity to 70% with the help of 3 common plants. He never used any electronic or electrical equipment for this.
On his Ted Talk he talks about 3 plants which you can see below, to get enough fresh air.
Areca Palm - Which you can keep in your living room, converts Carbon dioxide to oxygen.
Mother-in-law's tongue - This plant will generate Oxygen even at night so a plant which you can place on your bed room
Money plant - Kamal says that this plant can remove toxic materials like formaldehyde and other volatile gases from the atmosphere and purify the air.
How to grow your own fresh air by Kamal Meattle – Watch this TED video
Researcher Kamal Meattle shows how an arrangement of three common houseplants, used in specific spots in a home or office building, can result in measurably cleaner indoor air.