What is the air quality in Niihama today?

The current Air Quality Index (AQI) in Niihama is 30 (Good). PM2.5 concentration is 7.26 µg/m³.

What is the temperature in Niihama right now?

The current temperature in Niihama is 26.4°C (feels like 26.4°C). Humidity is 77.4% and wind speed is 108.5 km/h.

Is it safe to go outside in Niihama?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.7 (Low).

Air Quality in Niihama, Japan

Drizzle

26.4°C · 77.4% humidity

26.4°

Feels 26.4°

Good

Air quality is satisfactory. Enjoy outdoor activities.

2 stations

Nearby Monitoring Stations

AQI Forecast

27 6pm

30 9pm

26 12am

25 3am

24 6am

24 9am

24 12pm

24 3pm

Air Quality Index Trend

45h · 9 stn

View full history →

Niihama's air quality is influenced by industrial emissions, vehicle traffic, and regional pollution transport. Winter heating season and spring dust events typically create the most challenging air quality conditions.

77.4%

Humidity

108.5 km/h

Wind ENE

1002.6 hPa

Pressure

0.7

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

7.26 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Niihama?

Temperature & Precipitation

PM2.5 Trend

45h · 9 stations

PM2.57.26 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX0.7

Low

Station readings (2 stations within 25 km)

7.26

Median

5.9

Average

3.6

Low

8.2

High

PM2.5 µg/m³ · Model: 6.25 · Bias: -1.0

What is the 7-day forecast for Niihama?

09-05

27.2° 25.0°

2.31 mm

09-06

27.3° 25.0°

2.56 mm

09-07

27.4° 25.1°

0.69 mm

09-08

27.6° 23.0°

14.69 mm

09-09

27.2° 24.6°

2.38 mm

09-10

27.6° 25.3°

0.69 mm

09-11

25.9° 22.9°

11.06 mm

Both models agree Avg diff: 3.5°C

Where are air quality stations near Niihama?

Hongo, Niihama, Ehime, Japan (中村新居浜市)

3.9 km PM2.5: 7.2 µg/m³

Omachi, Saijo, Ehime, Japan (西条西条市)

11.5 km PM2.5: 8.2 µg/m³

Mishimamiyagawa, Shikokuchuo, Ehime, Japan (伊予三島四国中央市)

22.7 km PM2.5: 3.6 µg/m³

What cities are near Niihama?

34 Saijō 15 Shikokuchūō 18 Kawanoechō 34 Imabari 30 Kan’onjichō 13 Innoshima 30 Tōon 22 Mitoyo 23 Shinagawa 38 Ikedachō

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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-09-05T12:12 UTC.