Increase ventilation by opening windows and doors
Use fans to improve air circulation
Add indoor plants
Use an air purifier with a fresh air intake if available
Fix or reduce sources of indoor pollution
Avoid smoking indoors
Reduce use of candles, incense, and strong chemical cleaners
Maintain HVAC systems and replace filters regularly
Install or use supplemental oxygen only under medical supervision
Move to a higher-oxygen environment if medically advised
Take slow, deep breaths
Sit upright to improve breathing
Seek immediate medical help if oxygen levels are dangerously low