Pothos. Pothos is the number one indoor plant for air purification. It has a high rate of oxygen conversion. The test showed that there was a 6. CO2 content while increasing the oxygen. Pothos is the plant that brings money and good luck to the home. It is an easy to care houseplant that needs bright, low, indirect sunlight. Let the soil dry between watering. This plant is well known for its sharp green streak leaves, and therefore, this will beautify your interiors.