Bad air worse again, fog to return

Delhi’s air quality plummeted to the “severe” level on Friday–first time this December–as the weather deteriorated and the Met office warned of dense fogin isolated pockets over the weekend. For nearly a month, the air quality index (AQI) kept fluctuating between “poor” and “very poor” categories. There were many “severe” days in November, the last was on November 29. But on Friday , levels of PM 2.5 (fine, respirable pollution particles) shot up by many times. The sky appeared hazy through the day. According to Central Pollution Control Board (CPCB),…

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