Wind speed brings slight improvement in Delhi's air quality

Pollution levels reduced slightly in the national capital on Friday with favourable wind speed helping in the dispersion of pollutants, according to India Meteorological Department officials. The city recorded an air quality index (AQI) of 251 at 10 am. The 24-hour average AQI was 315 on Thursday, the worst since February 12 (AQI 320). 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'.

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