Final answer:
The Air Quality Index (AQI) uses a scale to assess the levels of pollutants in the outdoor air. A value in the range of 151-200 corresponds to Unhealthy air quality condition.
Step-by-step explanation:
The Air Quality Index (AQI) uses a scale to assess the levels of pollutants in the outdoor air based on their human health effects. In this scale, a value in the range of 151-200 corresponds to Unhealthy air quality condition.
When the AQI is in this range, outdoor activities should be limited, especially for sensitive individuals with asthma, respiratory illnesses, and cardiovascular diseases. The pollutants that contribute to this high level of air pollution are primarily ground-level ozone and particulates, which can cause damage to the respiratory and circulatory systems.