SmogRank / World / Asia / Japan / Chiba

Most polluted cities in Chiba, Japan

31 measured cities, last 30 days; 0 above the WHO 24-hour guideline. Worst: Sukayama at 7.6 µg/m³, #1,091 in the world.

About 0 people in these 10 cities 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.

Gunma: 8 measured citiesIbaraki: 19 measured citiesKanagawa: 21 measured citiesSaitama: 31 measured citiesTochigi: 9 measured citiesTokyo: 10 measured citiesChiba: 31 measured cities#31 Tōgane: 4.5 µg/m³#29 Yotsukaidō: 4.6 µg/m³#30 Ajiki: 4.6 µg/m³#25 Yachimata: 4.8 µg/m³#26 Kōzaki: 4.8 µg/m³#27 Katsuura: 4.8 µg/m³#28 Baraki: 4.8 µg/m³#23 Omigawa: 4.9 µg/m³#24 Sodegaura: 4.9 µg/m³#20 Matsudo: 5.0 µg/m³#21 Ōami: 5.0 µg/m³#22 Narashino: 5.0 µg/m³#19 Sōsa: 5.1 µg/m³#18 Narita: 5.2 µg/m³#14 Tateyama: 5.4 µg/m³#15 Yokoshiba: 5.4 µg/m³#16 Yachiyo: 5.4 µg/m³#17 Motona: 5.4 µg/m³#13 Noda: 5.5 µg/m³#11 Kashiwa: 5.6 µg/m³#12 Inzai: 5.6 µg/m³#8 Urayasu: 5.7 µg/m³#9 Kisarazu: 5.7 µg/m³#10 Chiba: 5.7 µg/m³#7 Mobara: 5.8 µg/m³#5 Ichinomiya: 5.9 µg/m³#6 Kamagaya: 5.9 µg/m³#3 Sakura: 6.0 µg/m³#4 Ichihara: 6.0 µg/m³#2 Kimitsu: 6.6 µg/m³#1 Sukayama: 7.6 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Kimitsu 0 0.750
Every measured city in Chiba, Japan with monitors in two or more places, one column each, ranked by people breathing unhealthy air: height is people on an average day, colour its average. Point at it to read a city; tap to open it.
  1. 1Kimitsu 0
  2. 2Sakura 0
  3. 2Ichihara 0
  4. 4Urayasu 0
  5. 4Kisarazu 0
  6. 4Chiba 0
  7. 7Kashiwa 0
  8. 8Matsudo 0
  9. 8Narashino 0
  10. 10Sodegaura 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

Chiba 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
Nagareyama≈ 5 µg/m³Good
Abiko≈ 5 µg/m³Good
Katori-shi≈ 5 µg/m³Good
Asahi≈ 5 µg/m³Good
Shiroi≈ 7 µg/m³Good
Choshi≈ 5 µg/m³Good
Futtsu≈ 4 µg/m³Good
Ryōgoku≈ 4 µg/m³Good
Sanmu≈ 5 µg/m³Good
Ōamishirasato≈ 5 µg/m³Good
Sawara≈ 5 µg/m³Good
Hasaki≈ 5 µg/m³Good
Minamibōsō≈ 5 µg/m³Good
Isumi≈ 4 µg/m³Good
Yōkaichiba≈ 5 µg/m³Good
Kamogawa≈ 5 µg/m³Good
Makuhari≈ 6 µg/m³Good
Narutō≈ 5 µg/m³Good
Shisui≈ 4 µg/m³Good
Ōhara≈ 4 µg/m³Good
Minaminagareyama≈ 5 µg/m³Good

Bad-air episodes in Chiba

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 Chiba, Japan, PM2.5, last 30 days to 6 Oct 2026, 22:00 UTC, smogrank.com/jp/region/chiba?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.