national capital witnessed ‘moderate’ category air quality until yesterday, when the AQI dropped to 266. Air Quality Index (AQI) is a mechanism used tool used for effective communication of air quality status to people in terms that are easy to understand.
There are six AQI categories, namely Good Satisfactory, Moderately polluted, Poor, Very Poor, and Severe. These categories is decided based on ambient concentration values of air pollutants and their likely health impacts (known as health breakpoints).
Read more on livemint.com