Answer: Air Quality Index (AQI)
Explanation:
Air quality index (AQI) is a report which informs the public about the level of pollution. When AQI rises, so does public health risk.
In the United States, AQI comprises six categories that indicate increasing levels of health risk. If AQI value is below 50, it means that air quality is good. On the other hand, if value reaches 300, air quality is unhealthy.
