Table 2.
Summary of air quality index and raw concentration in maximum, mean, minimum, and standard deviation with AQI category from 2016 to 2019 intervals from Addis Ababa central monitoring station on 21 and 22 November.
| Parameter | AQI | AQI category | Raw concentration. µg/m3 | Year |
|---|---|---|---|---|
| Maximum | 68 | Moderate | 22 | 21-11-2016 |
| Mean | 49.37 | Good | 12.58 | |
| Minimum | 28 | Good | 6 | |
| Stand deviation | 10.93 | Good | 4.78 | |
| Maximum | 171 | Unhealthy | 106 | 21-11-2017 |
| Mean | 112 | Unhealthy for sensitive | 44.17 | |
| Minimum | 53 | Moderate | 11 | |
| Stand deviation | 40.9 | Moderate | 29.90 | |
| Maximum | 177 | Unhealthy | 176 | 21-11-2018 |
| Mean | 68.96 | Moderate | 23.3 | |
| Minimum | 21 | Good | 3 | |
| Stand deviation | 45.20 | Good | 39.05 | |
| Maximum | 184 | Unhealthy | 215 | 22-11-2019 |
| Mean | 77.6 | Moderate | 30.625 | |
| Minimum | 24 | Good | 4 | |
| Stand deviation | 51.8 | Moderate | 49.21 |