MThe monitoring stations across the national capital, on 18 October, categorised Delhi's air quality to be 'very poor.'
The average (24-hour rolling) of PM 2.5 and PM 10, suspended respirable pollutants, were recorded as 120.8 and 248 micrograms per cubic metre by System of Air Quality and Weather Forecasting and Research or SAFAR around 5.30PM, as against the corresponding safe limits of 60 and 100.
SAFAR's Dhirpur, Pitampura, Delhi University, Pusa road, Mathura road and Airport stations had 'very poor' air quality index. Even last week, air quality fluctuated between moderate and poor categories.
In a letter to school principals, Deputy Chief Minister Manish Sisodia apprised them of the "manifold increase" in pollution levels due to use of crackers, advising them to raise awareness among children against its use.