Open windows and doors regularly to increase fresh air flow
Use exhaust fans in kitchens and bathrooms
Run ceiling fans or portable fans to improve air circulation
Keep indoor plants, but do not rely on them as the main solution
Avoid smoking indoors
Avoid burning candles, incense, or wood indoors
Use an air purifier with a HEPA filter
Clean dust, mold, and pet dander regularly
Maintain HVAC systems and replace filters on time
Fix water leaks and control humidity to prevent mold
Reduce indoor pollution from paints, cleaners, and aerosols
Check that gas appliances are properly vented
Do not block air vents or return ducts
Spend time outdoors when indoor air feels stale
Seek medical help if low oxygen is due to a health problem