Nagpur air pollution surged after Diwali, with PM2.5 and PM10 touching 500 and the AQI remaining in the poor category, doctors warned. From PM2.5 pollution to respiratory risks, the impact of firecrackers raises fresh questions about Nagpur's air quality NAGPUR: The lights, celebrations - Nagpur. Diwali smog pushes Delhi near severe AQI, with spikes across major Indian cities and Stage III GRAP restrictions in effect.