PM2.5 in Ulaanbaatar and Aimag Centres by Month (October 2025 to September 2026)
Monthly mean PM2.5 in µg/m³ at Ulaanbaatar and aimag-centre monitoring stations, October 2025 to September 2026. Ulaanbaatar peaked at 70.4 in December 2025 and aimag centres at 50.8 in January 2026; summer months were about 9 to 15 in both. Implausible readings (163 of 16,115 station-days) were removed before averaging.
Monthly mean PM2.5 in µg/m³ at Ulaanbaatar and aimag-centre monitoring stations, October 2025 to September 2026. Ulaanbaatar peaked at 70.4 in December 2025 and aimag centres at 50.8 in January 2026; summer months were about 9 to 15 in both. Implausible readings (163 of 16,115 station-days) were removed before averaging.