CAUSE
One question. One truth.
“"Why is Delhi air quality so bad?”
Delhi's poor air quality is primarily caused by high vehicular emissions and secondary particulate matter formation. Vehicular emissions contribute 40-50% of PM2.5 during peak hours, and secondary particulate matter accounts for 27% of winter pollution.
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CURRENT STATE
Delhi's air quality averaged an AQI of 232 in February 2026, the worst in three years. The city experienced 20 'poor' and two 'very poor' air quality days. Real-time AQI is currently 146 (Moderate) with PM10 at 146.
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