An AQI between 0-50 is considered good, 51-100 is satisfactory, 101-200 moderate, 201-300 poor, 301-400 very poor and 401-500 is marked as severe/hazardous.
from Latest News https://www.dnaindia.com/delhi/report-air-quality-in-delhi-starts-deteriorating-poor-aqi-in-several-areas-2847274






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