Air Quality Lab — Nagaoka, Japan
Air Quality Profile·
Nagaoka reports an annual PM2.5 of 12.0 µg/m³. That's roughly double the WHO 2021 guideline but still far below the EU annual limit of 25 µg/m³.
Nagaoka
Japan
JapanAnnual Average
FairWHO annual classification
12.0µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
8.08.0 µg/m³ — Good
1111 µg/m³ — Fair
1212 µg/m³ — Fair
1212 µg/m³ — Fair
1212 µg/m³ — Fair
1717 µg/m³ — Moderate
1414 µg/m³ — Fair
1414 µg/m³ — Fair
1313 µg/m³ — Fair
1414 µg/m³ — Fair
1111 µg/m³ — Fair
8.48.4 µg/m³ — Good
Jan
Feb
Mar
Apr
May
Jun
8.08.0 µg/m³ — Good
1111 µg/m³ — Fair
1212 µg/m³ — Fair
1212 µg/m³ — Fair
1212 µg/m³ — Fair
1717 µg/m³ — Moderate
Jul
Aug
Sep
Oct
Nov
Dec
1414 µg/m³ — Fair
1414 µg/m³ — Fair
1313 µg/m³ — Fair
1414 µg/m³ — Fair
1111 µg/m³ — Fair
8.48.4 µg/m³ — Good
Best months: Jan–Feb, DecWorst months: Jun–Jul, Oct
Good5–10 µg/m³Fair10–15 µg/m³Moderate15–25 µg/m³
Based on WUSTL PM2.5 dataset (2020–2024) · WHO 2021 thresholds
Confidence: ●●●
How air quality compares
Compared across Japan
Nagaoka: 12.0 µg/m³. Typical range in Japan: 11.7–13.4 µg/m³. Low anchor: Hamamatsu, 10.0 µg/m³. High anchor: Tokyo, 14.5 µg/m³.
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