Recording an Air Quality Index of 473, Bihar's Darbhanga became the most polluted city in the country, according to the latest data by Central Pollution Control Board
India's 9 other most polluted cities are also Bihar.
After Darbhanga which tops the toxic city chart, Siwan is the second most polluted city with AQI 460 "followed by Begusarai 457, Saharsa 454, Samastipur 437, Muzaffarpur 424, Chapra 420, Katihar 437, Purnia 431 and Bettiah 406," CPCB's 24-hour bulletin further revealed.
Also watch: Delhi's air quality slips back to 'very poor' category; days after anti-pollution curbs lifted
The deteriorating pollution level in these 10 cities made the AQI slip into "severe" category.
An AQI between 201 and 300 is considered poor, 301 and 400 very poor, and 401 and 500 severe.
(With PTI inputs)