Homes might have pesticides, nitrogen oxides, and even formaldehyde, among other things in the air. Studies from NASA state that 6-8 inch plants are best for every 100 square feet of space within the home. Cleaning air can also be as simple as getting a new air filter. If three months have gone by, it’s time to get a new filter. You will want to get the right dimensions for the air filter and watch the MERV rating for higher levels. Another solution is to add air cleaners to the HVAC system to purify the air in a home without any trouble.