Three cities in India are under high air quality alert warnings Monday after Diawli celebrants blew off enough fireworks to generate smog, Reuters reports. For coastal towns Kolkata and Mumbai it was something of an accomplishment, but the capital New Delhi was already in bad shape with air quality as it usually is this time of year due to the weather, hitting an AQI of 680 at midnight. For comparison, NYC on its worst day in early June, during the Canadian wildfire smoke storm, hit 480.