New Delhi: Air quality in the national capital deteriorated on Friday, gradually inching towards the “severe” category as parts of the massive Bhalswa landfill site continued to smoulder. The Central Pollution Control Board (CPCB) recorded the overall air quality index of Delhi at 358 this morning, which falls in the “very poor” category.

Faridabad, Noida, Greater Noida, Ghaziabad and Gurgaon had also recorded air quality in the ‘very poor’ category Thursday, according to CPCB data.

The air quality in the capital had shown signs of improvement on Monday as it moved from “very poor” to “poor” category.