| Dioxyde d azote (NO2) : moyennes journalières en µg/m3 | |||
| Date | Fribourg : Parc de Pérolles | Fribourg : Chamblioux | Bulle : Rue de Vevey |
| 28.08.2023 | 6 | 15 | 20 |
| 29.08.2023 | 5 | 15 | 14 |
| 30.08.2023 | 6 | 20 | 15 |
| 31.08.2023 | 7 | 19 | 13 |
| 01.09.2023 | 6 | 24 | 16 |
| 02.09.2023 | 6 | 24 | 9 |
| 03.09.2023 | 6 | 16 | 13 |
| 04.09.2023 | 8 | 25 | 13 |
| 05.09.2023 | 9 | 24 | 17 |
| 06.09.2023 | 9 | 34 | 14 |
| 07.09.2023 | 9 | 35 | 19 |
| 08.09.2023 | 9 | 40 | 17 |
| 09.09.2023 | 7 | 28 | 18 |
| 10.09.2023 | 6 | 25 | 8 |
| 11.09.2023 | 9 | 29 | 19 |
| 12.09.2023 | 8 | 24 | - |
| 13.09.2023 | 7 | 28 | 23 |
| 14.09.2023 | 7 | 13 | 12 |
| 15.09.2023 | 9 | 26 | 18 |
| 16.09.2023 | 7 | 25 | 10 |
| 17.09.2023 | 7 | 22 | 13 |
| 18.09.2023 | 7 | 21 | 13 |
| 19.09.2023 | 7 | 20 | 16 |
| 20.09.2023 | 7 | 27 | 12 |
| 21.09.2023 | 6 | 18 | 18 |
| 22.09.2023 | 5 | 14 | 13 |
| 23.09.2023 | 5 | 21 | 14 |
| 24.09.2023 | 5 | 19 | 7 |
| 25.09.2023 | 9 | 29 | 17 |
| 26.09.2023 | 10 | 32 | 15 |
| 27.09.2023 | 12 | 35 | 23 |