AQI At 500, Private Apps Show 1,800: CPCB Explains The Big Pollution Data Gap | Delhi | News18

Why does India's official Air Quality Index stop at 500, even as some private platforms report readings touching 1,800? The Central Pollution Control Board (CPCB) has issued a clarification amid growing questions over Delhi's pollution data following Diwali.The board says the 500-point ceiling is a feature of India's National Air Quality Index, introduced in 2015. At 500, air quality is...