Mokpo vs Sejong: PM2.5 compared
Over the last year, Sejong's air was 12% more polluted than Mokpo's: PM2.5 averaged 19.1 µg/m³ against 17.0, on the 334 days both cities were measured. Sejong had the dirtier air on 185 of those days, Mokpo on 142. Sejong was over the WHO's daily guideline of 15 µg/m³ on 173 of them, Mokpo on 168.
Right now
The last year, day by day
Month by month
Year by year
| Year | Mokpo | Sejong | Days Mokpo was worse |
|---|---|---|---|
| 2026 so far | 64 | 69 | 98 |
| 2025 | 62 | 68 | 144 |
| 2024 | 59 | 62 | 120 |
Means in US AQI over the days both cities were measured that year; a year shows once they share 30 such days.
Each city's worst days
Mokpo
- 15 Jan 202612645.5 µg/m³
- 14 Feb 202612545.3 µg/m³
- 16 Mar 202612344.3 µg/m³
Sejong
- 14 Feb 202616677.0 µg/m³
- 16 Jan 202616676.8 µg/m³
- 5 Feb 202615865.3 µg/m³
Daily means in US AQI, with µg/m³ beside them, since the index stops at its top value, over the days both cities were measured in the last year. Each date opens that day's world board.
Compare either city with another
Mokpo
Side by side with Muan (the nearest), Kimje (South Korea's 2nd worst on 30 days), Gujranwala (the world's worst on 30 days).
Sejong
Side by side with Cheongju-si (the nearest), Gujranwala (the world's worst on 30 days).
Use this page
SmogRank, PM2.5 daily means compared, Mokpo and Sejong, 9 Oct 2025 – 8 Oct 2026, smogrank.com/compare/kr-mokpo/kr-sejong (accessed 8 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.
The same rules as every SmogRank figure: reference monitors first, and a day counts with 18 measured hours. How we measure.
Updated 2026-10-08 20:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); Love My Air (City and County of Denver), no reuse terms published (why we use them).