One city crossed 300 and Pune’s reading is 2.5 times last year’s. Here’s the list, and why inland Maharashtra is. Diwali firecrackers triggered overnight pollution spikes in Mumbai, with Navy Nagar recording an AQI of 497 and several areas crossing 400. Mumbai's Diwali afternoon AQI fell nearly 30% from 2025, but firecrackers drove sharp night-time pollution spikes across several suburbs.