Delhi’s air quality dips into 'very poor' category ahead of winter, AQI surpasses 300
September 25, 2024 11:03 ISTAn AQI between 0-50 is considered "good", 51-100 "satisfactory", 101-200 "moderate", 201-300 "poor", 301-400 "very poor" and 401-500 "severe."