Air Quality Index Calculator
Calculate a simplified Air Quality Index from PM2.5 concentration and understand health risk categories.
Air Quality Index (AQI)
146 AQI
Air Quality Index (AQI) vs PM2.5 Concentration
Formula
## How to Calculate Air Quality Index The AQI converts pollutant concentrations into a standardized scale. ### Simplified PM2.5 to AQI **AQI (approx) = PM2.5 * 4.167** (for values up to ~100 AQI) ### AQI Categories - **0-50**: Good (green) - **51-100**: Moderate (yellow) - **101-150**: Unhealthy for sensitive groups (orange) - **151-200**: Unhealthy (red) - **201-300**: Very unhealthy (purple) - **301+**: Hazardous (maroon) The WHO guideline for annual PM2.5 is 5 ug/m3.
Esempio Risolto
PM2.5 of 35 ug/m3, spending 2 hours outdoors daily for 250 days/year.
- 01AQI: 35 * 4.167 = 146 (Unhealthy for sensitive groups)
- 02Annual exposure: 35 * 2 * 250 = 17,500 ug*hr/m3
- 03vs WHO: 35 / 5 * 100 = 700% above guideline
- 04Reduction needed: 35 - 5 = 30 ug/m3
Domande Frequenti
What is PM2.5?
PM2.5 refers to particulate matter 2.5 micrometers or smaller. These tiny particles penetrate deep into the lungs and bloodstream, causing respiratory and cardiovascular disease. Sources include combustion, vehicles, and industry.
What AQI level is safe for exercise?
AQI below 50 is safe for all outdoor activities. 51-100 is acceptable for most people. Above 100, sensitive groups should limit prolonged outdoor exertion. Above 150, everyone should reduce outdoor activity.
How can air quality be improved?
Reducing vehicle emissions, transitioning from coal to renewables, controlling industrial pollution, reducing agricultural burning, and increasing green spaces all improve air quality.