Winter PM2.5 by Aimag Centre (December 2025 to February 2026)
Mean PM2.5 (µg/m³) in 21 aimag-centre towns and Ulaanbaatar, December 2025 to February 2026. Murun in Khuvsgul had the highest winter mean at 111.3, ahead of Khovd (82.8) and Darkhan-Uul (81.0); Ulaanbaatar averaged 61.5, and 10 of 22 places were above the 50 µg/m³ limit. Implausible readings (163 of 16,115 station-days) were removed before averaging.
Mean PM2.5 (µg/m³) in 21 aimag-centre towns and Ulaanbaatar, December 2025 to February 2026. Murun in Khuvsgul had the highest winter mean at 111.3, ahead of Khovd (82.8) and Darkhan-Uul (81.0); Ulaanbaatar averaged 61.5, and 10 of 22 places were above the 50 µg/m³ limit. Implausible readings (163 of 16,115 station-days) were removed before averaging.