Explanation:

All of the above are correct.

• The NAQI was prepared by an expert group, set up the Ministry of Environment and Forests, comprising of renowned medical practitioners from hospitals and research agencies.
• The index is a part of the government’s Swachh Bharat Abhiyan.
• The index will measure eight major pollutants, namely, particulate matter (PM 10 and PM 2.5), nitrogen dioxide, sulphur dioxide, ozone, carbon monoxide, ammonia and lead. Currently, only particulate matter, nitrogen dioxide and sulphur dioxide are being measured.
• The index will be based on real time monitoring, and the health risks will be easily identified through a colour coded system.