Delhi and Mumbai were covered in dense smog this morning as the air quality worsened in the two metro cities. The air quality index (AQI) stood at 335 in Delhi at 8 am - in the "very poor category", according to Central Pollution Control Board (CPCB) data. The government's System of Air Quality and Weather Forecasting And Research (SAFAR) website advised people to avoid outdoor activities in the early morning and after sunset.
