India, Nov. 1 -- Delhi's air quality remained 'poor' on Saturday as the national capital recorded an Air Quality Index (AQI) of 233 at 7 am, while a thick layer of smog covered the city, according to data from the Sameer app developed by the Central Pollution Control Board (CPCB).

The capital city recorded an AQI of 268 on Friday, categorised as 'poor', which was a slight improvement compared to the last few days when the air quality had fallen to the 'very poor' category, including on Thursday when an AQI of 373 was recorded.

An AQI between 0 and 50 is considered 'good', 51-100 'satisfactory', 101-200 'moderate', 201-300 'poor', 301-400 'very poor', and 401-500 'severe'.

As per the latest update on the Sameer app, Delhi's AQI was in t...