National Air Quality Index is an effective dissemination tool of air quality to provide information to people. It was launched in 2014 with the tagline ‘One Number – One Color -One Description’ and is developed by the CPCB in consultation with IIT-Kanpur. The measurement of air quality is based on eight pollutants, namely: Carbon Monoxide (CO), Ozone (O3), Ammonia (NH3), Nitrogen Dioxide (NO2), Sulphur Dioxide (SO2), Particulate Matter (PM10), Particulate Matter (PM2.5), and Lead (Pb).