Delhi-NCR Pollution: Delhi's air quality hits 'very poor' category, AQI drops to...
https://ift.tt/bm2GWKF air quality index from 0 to 100 is considered 'good', 100 to 200 'moderate', 200 to 300 'poor', 300 to 400 'very poor' and from 400 to 500 or above 'severe'.
donewssuper.blogspot.com Sonali Sharma
donewssuper.blogspot.com Sonali Sharma
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