The AQI isn't a straight line; it's a scale where each pollutant's harm gets calculated separately. So 400 is an emergency level, but it's about the concentration of poison in the air, not simple maths. For us in Delhi, 100 feels like a mild relief you pray for, and 400 is the grey soup where your eyes sting walking to the stationery shop. The difference isn't arithmetic, it's whether you can see the Shiv temple on the hill from our rooftop or not.
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