How Delhi’s Air Hurts the Brain
When AQI in Delhi shoots into the “very poor” or “severe” range, levels of PM2.5 – ultra‑fine particles small enough to enter the bloodstream – can reach over ten times the World Health Organization’s recommended limit. These particles can travel from the lungs into the blood and even reach the brain, where they trigger inflammation and oxidative stress that slowly damage neurons and blood vessels. Doctors in Delhi report more cases of persistent headaches, irritability, poor focus, sleep disturbance, and a constant sense of mental tiredness during pollution ...