New Delhi/IBNS, Nov. 28 -- As Delhi continues to battle hazardous air pollution levels, the US Embassy in New Delhi has floated a tender seeking 1,200 boxes of True HEPA filter sets for its Blueair 500 and 600 series air purifiers, Hindustan Times reported.

The embassy, which uses Blueair air purifier systems, has sought filter sets compatible with Blueair 501, 503, 510, 601, 603, and 650E models, according to the solicitation document.

Delhi's air quality plunged further on Friday morning, with the overall AQI touching 384 at 8 am, pushing the national capital deep into the "very poor" category as residents struggle to breathe during peak winter.

The situation was no better across the National Capital Region. Noida recorded an AQI of ...