AQI 400 Isn't Twice as Bad as AQI 200

Описание: India's AQI isn't a measurement or an average: it's the worst score among up to eight pollutants, on a scale with a different straight line in each band. For fine dust, AQI 200 is about 90 µg/m³ and AQI 400 about 250: nearly three times, not two. Full story: Delhi's Air Gets Worse After the Farm Fires Stop.

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