Table 3.
Results of the parametric test for O3 concentrations
| Variables (stations) | n | Mean (ug/m3) | Std. Dev. | t |
H0 : Xd = 0 Pr(| T| > | t| ) |
Increase between stations* |
|---|---|---|---|---|---|---|
| Belisario 2018 | 158 | 15.27 | 1.41 | − 25.94 | 0.000 | 2.61 |
| Belisario 2019 | 158 | 24.18 | 1.20 | − 10.95 | 0.000 | 1.88 |
| Belisario 2020 | 158 | 39.92 | 1.41 | |||
| Carapungo 2018 | 159 | 25.08 | 1.43 | − 4.50 | 0.000 | 1.19 |
| Carapungo 2019 | 159 | 26.50 | 1.70 | − 2.69 | 0.008 | 1.12 |
| Carapungo 2020 | 159 | 29.78 | 0.91 | |||
| Centro 2018 | 162 | 17.40 | 1.49 | − 24.88 | 0.000 | 2.28 |
| Centro 2019 | 162 | 18.57 | 1.45 | − 20.86 | 0.000 | 2.13 |
| Centro 2020 | 162 | 39.59 | 1.54 | |||
| Cotocollao 2018 | 157 | 26.30 | 1.61 | − 6.08 | 0.000 | 1.32 |
| Cotocollao 2019 | 157 | 25.83 | 1.98 | − 6.18 | 0.000 | 1.34 |
| Cotocollao 2020 | 157 | 34.66 | 1.24 | |||
| El Camal 2018 | – | – | – | – | – | – |
| El Camal 2019 | – | – | – | – | – | – |
| El Camal 2020** | – | – | – | |||
| Guamani 2018 | 159 | 25.04 | 1.84 | − 13.08 | 0.000 | 1.63 |
| Guamani 2019 | 159 | 35.18 | 1.90 | − 3.76 | 0.000 | 1.16 |
| Guamani 2020 | 159 | 40.78 | 1.73 | |||
| Los Chillos 2018 | 160 | 20.99 | 1.58 | − 15.05 | 0.000 | 1.71 |
| Los Chillos 2019 | 160 | 29.59 | 2.27 | − 4.39 | 0.000 | 1.21 |
| Los Chillos 2020 | 160 | 35.82 | 1.45 | |||
| Average increase* | 2018: 1.48 | 2019: 1.79 |
*In comparison to 2020 (number of times)
**This station did not report data on O3 concentrations for 2020. Therefore, it was not possible to compare it with the other years