Clearing the air: Delhi’s AQI 2000+ or under 400? Why apps show different figures

Delhi residents were confused by vastly different pollution readings on Tuesday. While India’s CPCB showed AQI below 400, international apps like IQAir reported over 2,000. Experts explain these discrepancies stem from different calculation methods and data sources, though both indicate dangerously poor air quality post-Diwali.