SmogRank / World / Asia / Japan / Ibaraki

Most polluted cities in Ibaraki, Japan

19 measured cities, last 30 days; 0 above the WHO 24-hour guideline. Worst: Kamisu at 10.3 µg/m³, #601 in the world.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

Gunma: 8 measured citiesIbaraki: 19 measured citiesKanagawa: 21 measured citiesNiigata: 12 measured citiesSaitama: 31 measured citiesTochigi: 9 measured citiesTokyo: 10 measured citiesFukushima: 7 measured citiesChiba: 31 measured cities#19 Koga: 3.9 µg/m³#18 Hitachiomiya: 4.1 µg/m³#17 Hitachi: 4.3 µg/m³#16 Kitaibaraki: 4.4 µg/m³#15 Ishioka: 4.6 µg/m³#14 Hokota: 4.7 µg/m³#12 Toride: 5.1 µg/m³#13 Kasama: 5.1 µg/m³#10 Mito: 5.2 µg/m³#11 Chikusei: 5.2 µg/m³#9 Hitachi-Naka: 5.3 µg/m³#8 Bandō: 5.5 µg/m³#6 Inashiki: 5.9 µg/m³#7 Jōsō: 5.9 µg/m³#5 Shimo-tsuma: 6.4 µg/m³#4 Naka: 6.8 µg/m³#2 Kashima-shi: 7.1 µg/m³#3 Tsuchiura: 7.1 µg/m³#1 Kamisu: 10.3 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Kamisu 0% 0.75%0
Every measured city in Ibaraki, Japan, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Kamisu 0%
  2. 2Kashima-shi 0%
  3. 2Tsuchiura 0%
  4. 4Naka 0%
  5. 5Shimo-tsuma 0%
  6. 6Inashiki 0%
  7. 6Jōsō 0%
  8. 8Bandō 0%
  9. 9Hitachi-Naka 0%
  10. 10Mito 0%
  11. 10Chikuseilast full day 1 Oct 0%
  12. 12Toride 0%
  13. 12Kasama 0%
  14. 14Hokota 0%
  15. 15Ishioka 0%
  16. 16Kitaibaraki 0%
  17. 17Hitachi 0%
  18. 18Hitachiomiya 0%
  19. 19Koga 0%
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

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

Ibaraki 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.

City7-day estimateBand
Tsukuba≈ 6 µg/m³Good
Katsuta≈ 5 µg/m³Good
Ryūgasaki≈ 6 µg/m³Good
Ushiku≈ 6 µg/m³Good
Moriya≈ 6 µg/m³Good
Shimodate≈ 6 µg/m³Good
Inada≈ 5 µg/m³Good
Yūki≈ 5 µg/m³Good
Tsukubamirai≈ 6 µg/m³Good
Omitama≈ 5 µg/m³Good
Hitachi-ota≈ 5 µg/m³Good
Ami≈ 6 µg/m³Good
Iwai≈ 5 µg/m³Good
Mitsukaidō≈ 6 µg/m³Good
Kasumigaura≈ 4 µg/m³Good
Iwase≈ 6 µg/m³Good
Sakuragawa≈ 6 µg/m³Good
Tomobe≈ 5 µg/m³Good
Funaishikawa≈ 5 µg/m³Good
Okunoya≈ 5 µg/m³Good
Fujishiro≈ 6 µg/m³Good
Namegata≈ 5 µg/m³Good
Takahagi≈ 4 µg/m³Good
Itako≈ 5 µg/m³Good
Ōmiya≈ 5 µg/m³Good
Ishige≈ 6 µg/m³Good
Sakai≈ 5 µg/m³Good
Yachiyo≈ 5 µg/m³Good
Edosaki≈ 4 µg/m³Good
Makabe≈ 6 µg/m³Good
Ishitsuka≈ 5 µg/m³Good
Ōarai≈ 5 µg/m³Good
Daigo≈ 4 µg/m³Good
Fukawa≈ 6 µg/m³Good

Bad-air episodes in Ibaraki

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 Ibaraki, Japan, PM2.5, last 30 days to 6 Oct 2026, 22:00 UTC, smogrank.com/jp/region/ibaraki?w=30d.

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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.