ROHTAK, Nov. 14 -- Air pollution continues to remain a major concern in Haryana, with four cities figuring among the country's 13 most polluted urban centres and seven others recording 'poor' air quality, even as restrictions under the graded response action plan (GRAP) remained in force across Delhi-NCR.

Ballabgarh emerged as the most polluted city in the country, recording an Air Quality Index (AQI) of 400. Gurugram reported an AQI of 324, Manesar,316, and Bahadurgarh, 308, placing all four in the 'very poor' category.

Among other Haryana cities Faridabad recorded an AQI of 298, followed by Jind, 261, Fatehabad, 247, Bhiwani, 245, Dharuhera, 229, Yamunanagar, 219, and Palwal, 210, all falling in the 'poor' category.

The deteriorating...