Air Quality in Hachiōji, Japan

Drizzle
22.3°C · 88.6% humidity
22.3°
Feels 22.3°
77
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
12 stations

Nearby Monitoring Stations

AQI Forecast
54 5am
54
54
77 8am
70
66
62 11am
60
70
69 2pm
68
68
67 5pm
67
55
66 8pm
66
66
66 11pm
66
66
66 2am
54
54
AD 728×90

Air Quality Index Trend

47h · 8 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. Current PM2.5 concentration in Hachiōji is 1.6× the WHO 24-hour guideline of 15 µg/m³.

88.6%
Humidity
15.9 km/h
Wind N
1003.2 hPa
Pressure
9.4
UV Very High
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
77
24.6 µg/m³
PM10
31
34.3 µg/m³
050100150200300500

What is the weather forecast for Hachiōji?

Temperature & Precipitation

PM2.5 Trend

47h · 8 stations
PM2.524.6 µg/m³ ×1.6 WHO
Moderate
PM1034.3 µg/m³
Good
UV INDEX9.4
Very High
AD 300×250
Station readings (12 stations within 25 km)
24.6
Median
15.23
Average
2.4
Low
26.8
High
PM2.5 µg/m³ · Model: 16.35 · Bias: -8.2

What is the 7-day forecast for Hachiōji?

07-21
30.4° 20.4°
14.0 mm
07-22
26.4° 22.0°
1.69 mm
07-23
25.3° 18.5°
2.44 mm
07-24
25.4° 22.0°
4.44 mm
07-25
30.8° 21.5°
0.38 mm
07-26
29.4° 21.0°
0.13 mm
07-27
29.9° 22.0°
10.31 mm
Both models agree Avg diff: 3.2°C

Where are air quality stations near Hachiōji?

68
Hachioji (八王子)
1.4 km PM2.5: 20.2 µg/m³
17
Katakuramachi, Hachioji, Tokyo, Japan (八王子市片倉町八王子市)
2.2 km PM2.5: 4.1 µg/m³
70
八王子市大楽寺町
3.3 km 87.9% RH PM2.5: 21.0 µg/m³ PM10: 25.0 µg/m³
72
Tatemachi, Hachioji, Tokyo, Japan (八王子市館町八王子市)
4.5 km PM2.5: 22.1 µg/m³
55
Honchō, Fussa-shi, Tōkyō-to, Japan (福生市本町福生市)
8.9 km PM2.5: 14.0 µg/m³
6
Honchō, Fussa-shi, Tōkyō-to, Japan (福生市本町福生市)
8.9 km PM2.5: 1.4 µg/m³
26
Nakano, Kanagawa, Japan (津久井相模原市緑区)
9.8 km PM2.5: 6.2 µg/m³
30
Ochikawa, Hino, Tokyo, Japan (川崎街道百草園日野市)
10.1 km PM2.5: 7.2 µg/m³
47
Ochikawa, Hino, Tokyo, Japan (川崎街道百草園日野市)
10.1 km PM2.5: 11.3 µg/m³
25
Sagamihara (相模原)
10.4 km PM2.5: 6.0 µg/m³

What cities are near Hachiōji?

54 Aihara 59 Hino 55 Akishima 58 Fussa 54 Tachikawa 56 Kunitachi 59 Akiruno 51 Yokota 53 Hamura 58 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 2026-07-21T23:16 UTC.