For the first time this season, Delhi’s air has turned ‘severe’, the worst category in six-level Air Quality Index (AQI) assessed by the Central Pollution Control Board (CPCB), on Tuesday. It is denoted in the CPCB bulletin with a visibly alarming ‘maroon’ colour, preceded by ‘very poor’ denoted in red, ‘poor’ in orange, ‘moderate’ in yellow and ‘satisfactory’ in green.The AQI number for the Capital was 401, exactly the threshold level at which it turns ‘severe.’ The last time this happened in Delhi was from June 13-19 when a dust storm arising in Rajasthan had badly affected the entire Indo-Gangetic plains region. It had shot off the charts that time. Notably on Tuesday, almost all the NCR cities were in the ‘severe’ bracket with Ghaziabad faring the worst at an AQI of 451, followed by Gurugram at 426, Faridabad 413 and Noida 408.
Delhi turns gas chamber