With a slight improvement, air quality in the national capital settled in the 'poor' category on Saturday due to the increased wind speed which is favourable for dispersion of pollutants, authorities said. Four areas of Delhi recorded 'very poor' air quality while 22 areas recorded 'poor' air quality, according to data of the Central Pollution Control Board (CPCB).
The overall air quality index (AQI) was recorded at 264 which falls in the 'poor' category, the data said.
The level of PM2.5 (particles in the air with a diameter of less than 2.5 micrometres) was recorded at 119 and the PM10 level was recorded at 235, it said.
An AQI between 0 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 air quality has improved due to higher wind speed, said the Indian Institute of Tropical Meteorology, adding the Particulate Matter (PM) concentration is likely to reduce owing to increased wind speed and air quality is likely to be in poor category.
Humidity in the national capital is high which is slightly unfavourable and stubble fire will have marginal impact, it said.
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