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This Indian City is the Most Polluted in Asia And It’s Not Delhi | Details Here The AQI between 0 and 50 is considered ‘good’, 51-100 ‘Moderate, 101-150 Unhealthy for Sensitive Groups, 151-200 ‘Unhealthy, 201-300 ‘Very Unhealthy’ and 300+ ‘Hazardous’ as per the Air Quality Index scale defined by the US-EPA 2016 standard