SmogRank / World / Japan / Osaka / December 2025

Most polluted cities in Osaka, Japan, December 2025

15 cities in Osaka, Japan ranked by their average PM2.5 over the 31 days. Worst: Higashiosaka at 10.6 µg/m³, #1,203 of 2,960 cities in the world. Cleanest: Yono at 5.7. A city needs measurements on 70% of the days to be ranked.

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.

← Higashiosaka 0% 0.75%0

Every city in Osaka, Japan ranked for December 2025, 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.

1Higashiosaka
0%
2Osaka
0%
3Yao
0%
4Kishiwada
0%
5Sakai
0%
6Habikino
0%
7Hirakata
0%
8Tondabayashichō
0%
9Izumisano
0%
9Kawachi-Nagano
0%
11Sennan
0%
12Izumi
0%
13Toyonaka
0%
13Sayama
0%
15Yono
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

All cities in the world, December 2025 · All cities in Japan, December 2025 · Osaka now

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SmogRank, most polluted cities in Osaka, Japan, PM2.5, December 2025, smogrank.com/jp/region/osaka/history/2025-12 (accessed 6 Oct 2026).

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