Koch'ang vs Mokpo: PM2.5 compared
Over the last year, Mokpo's air was 11% more polluted than Koch'ang's: PM2.5 averaged 17.0 µg/m³ against 15.3, on the 326 days both cities were measured. Mokpo had the dirtier air on 220 of those days, Koch'ang on 102. Mokpo was over the WHO's daily guideline of 15 µg/m³ on 165 of them, Koch'ang on 131.
Right now
The last year, day by day
Month by month
Year by year
| Year | Koch'ang | Mokpo | Days Koch'ang was worse |
|---|---|---|---|
| 2026 so far | 63 | 64 | 93 |
| 2025 | 57 | 62 | 81 |
| 2024 | 58 | 59 | 129 |
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
Koch'ang
- 15 Jan 202615460.3 µg/m³
- 16 Mar 202614051.3 µg/m³
- 7 Dec 202514051.2 µg/m³
Mokpo
- 15 Jan 202612645.5 µg/m³
- 14 Feb 202612545.3 µg/m³
- 16 Mar 202612344.3 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
Koch'ang
Side by side with Jangseong (the nearest), Gujranwala (the world's worst on 30 days).
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).
Use this page
SmogRank, PM2.5 daily means compared, Koch'ang and Mokpo, 9 Oct 2025 – 8 Oct 2026, smogrank.com/compare/kr-koch-ang/kr-mokpo (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).