How many levels or categories are in the AQI?Group of answer choicesFiveSixThreeFour

The Air Quality Index (AQI) is a standardized system used to communicate the quality of air in a location. The AQI typically consists of five levels or categories, which are as follows:

1. Good (0-50): Air quality is considered satisfactory, and air pollution poses little or no risk.
2. Moderate (51-100): Air quality is acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.
3. Unhealthy for Sensitive Groups (101-150): Members of sensitive groups may experience health effects, but the general public is not likely to be affected.
4. Unhealthy (151-200): Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.
5. Very Unhealthy (201-300): Health alert: everyone may experience more serious health effects.
6. Hazardous (301-500): Health warnings of emergency conditions. The entire population is more likely to be affected.

Since the question specifies options, the correct answer from the group of choices given is Five.