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Days Above Mongolia's PM2.5 Limit in Ulaanbaatar by Month (October 2025 to September 2026)
Environment

Days Above Mongolia's PM2.5 Limit in Ulaanbaatar by Month (October 2025 to September 2026)

Ulaanbaatar's city-wide PM2.5 daily average (all reporting stations) was above Mongolia's 50 µg/m³ limit on 77 days between October 2025 and September 2026, all from November to February. December 2025 had 27 of 31 days above the limit, and the highest daily average was 112.1 µg/m³ in February 2026. Implausible readings (163 of 16,115 station-days) were removed before averaging.