New Delhi, Nov. 13 -- Delhi's air quality remained in the "severe" category for the second consecutive day on Wednesday, as a thick layer of smog continued to blanket the capital. With a 24-hour average air quality index (AQI) of 418 at 4pm, Delhi ranked as the most polluted city in the country along with Haryana's Jind, according to the Central Pollution Control Board (CPCB). On Tuesday, the capital had recorded an AQI of 428 - the highest since December 19 last year. The marginal improvement on Wednesday offered little relief, with stagnant winds and a temperature inversion continuing to trap pollutants close to the surface. Inversion occurs when a layer of warm air sits above cooler air, preventing pollutants from dispersing and creating...