5 points
*
The air quality in Delhi is usually around 150-250. (Quite horrible as it is)
This huge spike in AQI is caused by unregulated stubble burning in the neighbouring states. Farmers harvest rice and burn the leftovers so that they can hurry up and plant the next crop.
4 points
Makes sense, I’d never even heard of AQI hitting 999 before; it would be crazy if it were a more consistent thing there. Still crazy to think about ~200 being the norm when you’re not even supposed to walk outside at that level, according to WHO an CDC. It’s apparently as low as 100-150 that exercise becomes bad for you rather than improving fitness based just on how much more air you have to breathe.
2 points