Understand the air
PM2.5, AQI scales, Delhi’s pollution seasons and GRAP, explained plainly.
What is PM2.5, and why does it matter most?The tiny particles that do the most harm, where Delhi's come from, and which other pollutants matter.Reading AQI numbers without getting confusedIndia's AQI, the US AQI and PM2.5 in µg/m³ are three different numbers for the same air. How to read each, and which to trust.Delhi's pollution year, month by monthWhy winter is worst, when stubble smoke and Diwali hit, and a month-by-month checklist so you're ready before the season starts.GRAP explainedThe Graded Response Action Plan is Delhi NCR's emergency playbook for bad air. What each stage means, what changes for households and schools, and where to check the stage in force.How air pollution affects healthWhat PM2.5 does in the body, who is most at risk, and why lowering exposure helps at any level.