The overall air quality index (AQI) recorded at 4 pm Saturday stood at 300 which falls in the poor category and is just one point from being 'very poor', according to Centre-run System of Air Quality and Weather Forecasting and Research (SAFAR).
On Friday the AQI of the national capital stood at 154.
An AQI between 0-50 is considered 'good', 51-100 'satisfactory', 101-200 'moderate', 201-300 'poor', 301-400 'very poor', and 401-500 'severe'.
The PM10 level (presence of particles with diameter less than 10 micrometres) in Delhi stood at 243 and the PM2.5 level was recorded at 122, according to the data.
Authorities have predicted further deterioration of air quality in the coming days. The PM2.5 level was forecast to reach very poor level by tomorrow.
Burning of paddy straw every year during October and November and wheat straw during April in Punjab and Haryana are the major contributors of air pollution in Delhi-NCR, as the smoke travels towards the national capital. In Delhi, it mixes with the fog and creates a toxic smoggy winter every year.
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