Simple ways to keep your home’s

air clean according to WebMD:

Keep furnace fan in “on” position to allow for air circulation for proper filtration
Change filters regularly to keep clean air moving throughout your home
Ensure all fresh air dampers and louvers are clean and working properly
Increase effectiveness of a standard furnace filter with a media air filter
Keep a healthy level of humidity
Use an exhaust fan or open a window while cooking or running the dishwasher
- - Fix leaking plumbing fixtures to prevent mold build up
  - Empty drip pans in your dehumidifier
  - Properly clean humidifiers and change water panels
Make your home a no smoking zone
Keep a large floor mat at every door to collect dirt and debris
Vacuuming, moping and wiping down frequently touched surfaces often