Question

Pollutant standards index (PSI) value between 101–199 denotes the air quality as ........

• A. good
• B. moderate
• C. unhealthy
• D. hazardous

Hint:

Remember: PSI or AQI values between 101 and 199 reflect air that may cause adverse health effects, especially for sensitive groups.

Answer 1

The Correct Option is C

The Pollutant Standards Index (PSI) or Air Quality Index (AQI) categorizes air quality levels based on pollutant concentrations. According to common standards: - 0–50: Good - 51–100: Moderate
- 101–199: Unhealthy
- 200–299: Very unhealthy
- 300 and above: Hazardous
Hence, a PSI value in the range of 101–199 indicates unhealthy air quality.