Air Quality in Hachiōji, Japan

Drizzle
21.5°C · 91.4% humidity
21.5°
Feels 21.5°
27
Good
Air quality is satisfactory. Enjoy outdoor activities.
28 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
22 4pm
20
22
27 7pm
26
25
24 10pm
21
21
21 1am
20
20
20 4am
20
20
20 7am
20
20
22 10am
22
22
22 1pm
22
22
Station readings 4h ago
AQI 21
PM2.5 5.0 µg/m³ · 4h ago
CAMS model adj -5
27
25
27
27
27
27
27
25
25
25
25
25
25
25
25
25
25
25
27
27
27
27
27
27
AD 728×90

Air Quality Index Trend

6h · 2 stn

Hachiōji'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.

91.4%
Humidity
22.4 km/h
Wind NE
1010.7 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
27
6.37 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for Hachiōji?

Temperature & Precipitation

PM2.5 Trend

6h · 2 stations
PM2.56.37 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX0.7
Low
AD 300×250
Station readings (28 stations within 25 km)
6.37
Median
5.19
Average
1.4
Low
12.1
High
PM2.5 µg/m³ · Model: 6.15 · Bias: -0.2

What is the 7-day forecast for Hachiōji?

09-05
24.8° 19.7°
36.81 mm
09-06
26.7° 20.5°
4.44 mm
09-07
28.1° 21.2°
4.25 mm
09-08
26.7° 20.1°
4.19 mm
09-09
24.5° 20.5°
7.44 mm
09-10
24.1° 22.2°
1.75 mm
09-11
29.0° 21.9°
0.31 mm
Both models agree Avg diff: 2.4°C

Where are air quality stations near Hachiōji?

30
Hachioji (八王子)
1.4 km PM2.5: 7.2 µg/m³
13
Katakuramachi, Hachioji, Tokyo, Japan (八王子市片倉町八王子市)
2.2 km PM2.5: 3.1 µg/m³
21
Katakuramachi, Hachioji, Tokyo, Japan (八王子市片倉町八王子市)
2.2 km PM2.5: 5.0 µg/m³
21
八王子市大楽寺町
3.3 km 78.2% RH PM2.5: 5.0 µg/m³ PM10: 12.0 µg/m³
34
Tatemachi, Hachioji, Tokyo, Japan (八王子市館町八王子市)
4.5 km PM2.5: 8.2 µg/m³
7
Tatemachi, Hachioji, Tokyo, Japan (八王子市館町八王子市)
4.5 km PM2.5: 1.7 µg/m³
18
Nakano, Kanagawa, Japan (津久井相模原市緑区)
9.8 km PM2.5: 4.3 µg/m³
21
Ochikawa, Hino, Tokyo, Japan (川崎街道百草園日野市)
10.1 km PM2.5: 5.0 µg/m³
17
Sagamihara (相模原)
10.4 km PM2.5: 4.1 µg/m³
19
Atago, Tama, Tokyo, Japan (多摩市愛宕多摩市)
10.5 km PM2.5: 4.6 µg/m³

What cities are near Hachiōji?

23 Aihara 21 Hino 24 Akishima 25 Fussa 23 Tachikawa 20 Kunitachi 26 Akiruno 24 Yokota 25 Hamura 25 Itsukaichi
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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 2026-09-05T10:27 UTC.