Delhi's air quality has plunged to 'severe' category, which carries the risk of affecting people's respiratory system, as smoke caused by fireworks, as part of Diwali festivities, blanketed the national capital.
The Centre's System of Air Quality and Weather Forecasting and Research (SAFAR) recorded the level of respirable pollutants, PM 2.5 and PM 10, at 283 and 517 micrograms per cubic metre respectively around 8 pm on Sunday, violating the safe limits by multiple times.
The prescribed standards of PM 2.5 and PM 10 are 60 and 100 respectively, and anything beyond that can harm the respiratory system.
SAFAR's monitoring stations at Pusa Road, Mathura Road, Dhirpur, Delhi University, Pitampura as well as Noida had air quality in the 'severe' zone.
It had forecast that the city's air will be severely polluted on 30 and 31 October.
The Central Pollution Control Board's (CPCB) monitoring stations, in areas like RK Puram, Anand Vihar, Mandir Marg and Shadipur, had similar 'severe' readings as well.
People have been advised not to go outdoors when air quality turns 'severe' as it has adverse effect especially on children, elders and those having heart or lung diseases.
Delhi Pollution Control Committee's (DPCC) real-time readings were also indicative of the increasing levels of pollution with the rise in the numbers of crackers going off.
By Monday evening, DPCC's Punjabi Bagh and Anand Vihar stations had PM 2.5 readings of 202 and 240 micrograms per cubic metre respectively, while PM 10 had risen to 429 and 766 micrograms per cubic metre.
Pollution has peaked in the national capital during Diwali as a hazardous mix of noxious gases and respirable pollutants hang very close to the surface due to low temperature and near-stagnant wind movement.
Smoke emanating from farm fires raging across agricultural fields of neighbouring Punjab and Haryana worsens the situation.
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