Q. Consider the following statements about the National Air Quality Index:
1. The National AQI uses 6 colour codes for the common man to judge the air quality within his vicinity.
2. The orange colour code indicates very poor category.
Which of the above given statement is/are correct? 
Answer: A
Notes:
Air Quality Index is a tool for effective communication of air quality status to people in terms, which are easy to understand. It transforms complex air quality data of various pollutants into a single number (index value), nomenclature and colour.
There are six AQI categories, namely Good, Satisfactory, Moderately polluted, Poor, Very Poor, and Severe. Each of these categories is decided based on ambient concentration values of air pollutants and their likely health impacts (known as health breakpoints). AQ sub-index and health breakpoints are evolved for eight pollutants (PM10, PM2.5, NO2, SO2, CO, O3, NH3, and Pb) for which short-term (upto 24-hours) National Ambient Air Quality Standards are prescribed.
Source: ForumIAS
