The dip in the air quality can be attributed to low wind speed and temperatures which allowed accumulation of pollutants.
Delhi recorded 954 cases on Monday, according to a health department bulletin. The bulletin said the number of tests conducted too was the lowest in July.
A CPCB official said a number of factors were responsible for the deteriorating air quality, including vehicular pollution, construction activities and meteorological factors.
The overall AQI deteriorated further and touched the 268 mark, which falls in the poor category.
The families were traced to Bihar, Uttar Pradesh and West Bengal.
The air quality in Delhi remained poor Sunday with drop in wind speed even as authorities predicted further fall in air quality index of the national capital in the coming days.
Trains on the busy Yellow Line that connects Jahangirpuri to HUDA city centre were delayed since 9:45 am after they were bunching up due to breakdown of one of the trains between Central Secretariat and Udyog Bhawan stations.
It is believed that the crop residue burning in the nearby states of Punjab and Haryana are contributing to polluting the air.
New Delhi's overall air quality index read 456 at 4 pm, up from 425 at 4 pm on Tuesday.
People were seen wading through knee-deep water in several areas. Commuters, too, had a hard time as vehicular traffic crawled on the roads clogged with long tailbacks.
The PM2.5 level (presence in the air of particles with a diametre of less than 2.5 micrometres) touched a new high at 158 as authorities predicted further deterioration of air quality in the coming days.
Interacting with the locals, Rahul asked them about the inconvenience they were facing and called on them to voice their indignation against the Centre's move of demonetisation, saying that it has become a major hassle in day to day life for the common man.
Taking exception to Health Minister Harsh Vardhan not mentioning the death of healthcare workers due to Covid-19 in his statement in Parliament, the Indian Medical Association has published a list of 382 doctors who died due to the viral disease and demanded that they be treated as "martyrs".
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