Delhi Air Quality Worsens Before Diwali, AQI Tops 400 in Some Areas

Air quality in Delhi has deteriorated ahead of the Diwali festival, with the Air Quality Index crossing 400 in several localities. The Central Pollution Control Board classifies AQI readings from 301 to 400 as very poor and 401 to 500 as severe. The board's scale ranges from good, at zero to 50, through satisfactory, moderate and poor categories. The article's guidance frames the current readings against this national standard.
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