The Air Quality Index, or AQI, is the primary system used to warn the public when air pollution is dangerous. It’s based on ...
(Arvind Yadav/HT PHOTO) An AQI between zero 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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