November 2025 Air Quality Matches 2018, 2024; Better Than 2023
December 3, 2025In November 2025, air quality was consistently good with 22 days of very low pollution and no days with high KBI values, showing similar levels to 2018 and 2024 but significantly better than 2023. Mean pollutant concentrations remained low, with no exceedances, although the mean O3 level was slightly higher than in 2018 and 2024.
In November 2025, there were 22 days with a KBI value of 1, indicating very low air pollution, and 8 days with a KBI value of 2. There were no days with KBI values of 3 or higher, suggesting that air quality was consistently good throughout the month. The mean concentrations of pollutants were 24.5 for O3, 21.5 for NO2, and 12.4 for PM10, with maximum values of 74.6, 51.8, and 40.9, respectively. There were no exceedances for NO2, O3, or PM10.
Compared to previous years, November 2025 shows similar air quality levels to 2018 and 2024, with a consistent number of days with low KBI values. The mean pollutant concentrations are generally in line with those years, although the mean O3 level is slightly higher than in 2018 and 2024. The air pollution in November 2025 is notably lower than in 2023, which had significantly higher mean O3 levels and more days with a KBI value of 2. Overall, November 2025 maintains a trend of relatively low air pollution compared to the more variable levels seen in previous years.
Table 1: Monthly Summary for November 2025
| metric | November 2025 | Avg since 2019 |
|---|---|---|
| Days with KBI = 1 | 22 | 18 |
| Days with KBI = 2 | 8 | 12 |
| Days with KBI = 3 | 0 | 0 |
| Days with KBI ≥ 4 | 0 | 0 |
| Max NO₂ [µg/m³] | 52 | 57 |
| Max O₃ [µg/m³] | 75 | 80 |
| Max PM₁₀ [µg/m³] | 41 | 63 |
| Mean NO₂ [µg/m³] | 21 | 20 |
| Mean O₃ [µg/m³] | 24 | 25 |
| Mean PM₁₀ [µg/m³] | 12 | 13 |
| NO₂ exceedances | 0 | 0 |
| O₃ exceedances | 0 | 0 |
| PM₁₀ exceedances | 0 | 0 |
Figure 1: Maximum and Average Ozone (O₃, µg/m³) Concentrations in November
Figure 2: Maximum and Average NO₂ Concentrations (µg/m³) in November
Figure 3: Maximum and Average Fine Particles (PM₁₀, µg/m³) in November
Additional resources: Luftqualität in den Kantonen AG. BE, BL, BS, JU, SO, Topic Air, Federal Office for the Environment, Switzerland, World's Air Pollution: Real-time Air Quality Index
🤖 This text was generated with the assistance of AI. All quantitative statements are derived directly from the dataset listed under Data Source.