SmogRank / World / Asia / Japan / Iwate
Most polluted cities in Iwate, Japan
8 measured cities, last 30 days; 0 above the WHO 24-hour guideline. Worst: Ichinoseki at 5.7 µg/m³, #1,900 in the world.
About 0 people in this city breathed unhealthy air on an average day over the last 30 days.
Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.
- 1Morioka 0
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
Estimated: cities without a monitor
Iwate cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.
| City | 7-day estimate |
|---|---|
| Kitakami | ≈ 5 µg/m³ |
| Mizusawa | ≈ 5 µg/m³ |
| Ōfunato | ≈ 4 µg/m³ |
| Hizume | ≈ 4 µg/m³ |
| Yahaba | ≈ 4 µg/m³ |
| Tōno | ≈ 4 µg/m³ |
| Ninohe | ≈ 4 µg/m³ |
| Hachimantai | ≈ 4 µg/m³ |
| Rikuzen-Takata | ≈ 4 µg/m³ |
| Shizukuishi | ≈ 4 µg/m³ |
| Kanegasaki | ≈ 5 µg/m³ |
| Yamada | ≈ 4 µg/m³ |
| Ōno | ≈ 4 µg/m³ |
Bad-air episodes in Iwate
- Japan and South Korea, March 202623 to 31 March 2026, 9 days322 cities86 µg/m³peak, Pohang
- Japan, 12 to 14 July 20243 days38 cities36 µg/m³peak, Nagai
- Japan and South Korea, April 202416 to 21 April 2024, 6 days519 cities93 µg/m³peak, Gyeongju
Times when many cities around here had PM2.5 at twice their usual or more on the same days.
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SmogRank, most polluted cities in Iwate, Japan, PM2.5, last 30 days to 6 Oct 2026, 22:00 UTC, smogrank.com/jp/region/iwate?w=30d.
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.
Updated 2026-10-06 22:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.