Delhi records season's worst AQI at 261

Delhi recorded an AQI of 261 on Sunday, placing it in 'Poor' category. This was the worst AQI of the season so far and the highest in 198 days. Delhi last crossed the 250 mark on April 17, when AQI stood at 263. A ban on the entry of non-BS-VI and other polluting vehicles into Delhi came into effect today.