Air becomes unhealthy when the air quality index (AQI) exceeds ____.
A) 1
B) 3
C) 10
D) 100

Question

Quizplus · Accepted Answer

The AQI is a numerical rating system used by countries around the world to report the level of air pollution. An AQI of 100 or higher is considered unhealthy because it indicates that the air has high levels of pollutants such as particulate matter, ozone, and nitrogen oxide. This can be harmful to people with respiratory problems, as well as children, the elderly, and people with weakened immune systems. Therefore, option D is the correct answer.

Air Becomes Unhealthy When the Air Quality Index (AQI) Exceeds