In March 2026, air quality at the NBCN monitoring station in Binningen was assessed using the Kurzzeit-Belastungs-Index (KBI), a composite index that combines levels of ozone (O₃), nitrogen dioxide (NO₂), and particulate matter (PM₁₀) into a single measure of short-term exposure. The month recorded 0 days with KBI 1, indicating low pollution, and 31 days with KBI 2, indicating moderate pollution. There were no days with KBI 3 or higher, meaning no marked, significant, or high pollution episodes occurred. The mean concentrations were 56.3 µg/m³ for ozone, 13.4 µg/m³ for nitrogen dioxide, and 16.8 µg/m³ for PM₁₀. The maximum concentrations reached 106.3 µg/m³ for ozone, 42.4 µg/m³ for nitrogen dioxide, and 121.7 µg/m³ for PM₁₀. All values are detailed in Table 1, with regulatory thresholds provided in Table 3.

Compared to previous years for March, the air quality in 2026 shows a mixed pattern. The number of days with KBI 1 ranked 6th out of 8 years, indicating fewer low-pollution days than in most recent years. The maximum PM₁₀ concentration was the highest ranked at 1st, reflecting the peak value of 121.7 µg/m³, while the maximum ozone concentration ranked 7th and maximum nitrogen dioxide ranked 8th, both among the lowest in the comparison period. Monthly average and maximum values for March are reported in Table 2 and visualized in Figures 1 to 3.