What Happens To Your Lungs When AQI Crosses 400

When AQI exceeds 400, toxic PM2.5 particles reach deep into the lungs and bloodstream, triggering inflammation, weakening cilia, and sharply increasing infection risks like pneumonia. Smog worsens asthma and bronchitis, suppresses immunity, and affects vulnerable groups most. Experts advise monitoring AQI, avoiding outdoor exertion and using N95 masks.