Videos circulating on social media showed vast sections of the river frothing, resembling clouds over the water which gradually dissipated later in the day

A thin layer of smog engulfed the national capital as the Air Quality Index dropped to 226 at 8 am, categorized as 'Poor' by the Central Pollution Control Board

The highest AQI was at the Akshardham and Anand Vihar area at 334 at 8 am, categorized as 'Very Poor', followed by an AQI of 253 at AIIMS and surrounding areas

At India Gate, the AQI dropped to 251 at 8 am, categorized as 'Poor'

As per the Central Pollution Control Board, the AQI when marked under the 'Poor' category can cause breathing discomfort to most people on prolonged exposure, whereas, when under the 'Very poor' category can cause respiratory illness on prolonged exposure

In some areas, the air quality was worse

The AQI in Mundka and Bawana stood at 366, Wazirpur 355, Jahangirpuri 347 and Anand Vihar 333, all in the 'very poor' category, the data showed

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

The ruling Aam Aadmi Party (AAP) said the city government is closely monitoring the situation