Delhi Air Pollution: The Air Quality Index (AQI) of thenational capital peaked at a hazardous 764 around on November 13. Beijing, in comparison, reached 236 on November 5, with an annual average AQI of 77 versus Delhi’s 129. Both capitals are centres of huge populations and rapidly growing economies, but the contrast in air quality is severe. Historical AQI peaks in Delhi have reportedly reached 1000 to 1200 on some days.

Air pollution is measured in PM10 and PM2.5, which are tiny particles that penetrate deep into lungs. The World Health Organisation (WHO) recommends annual limits of 15 μg/m³ for PM10 and 5 μg/m³ for PM2.5. India dominates global pollution rankings, with 13 of the world’s 25 most polluted cities.

Delhi alone recorded PM2.5 at 602 μg/m³ and PM10 at 999 μg/m³ on November

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