Air Quality in Hirai, Japan

Rain
23.6°C · 87.1% humidity
23.6°
Feels 23.6°
66
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
43 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
87 6am
86
69
66 9am
69
69
69 12pm
86
86
86 3pm
86
86
69 6pm
69
69
69 9pm
69
69
69 12am
86
86
86 3am
86
87
Station readings
10
CAMS model adj +3
84
83
66
66
66
66
66
83
83
83
83
83
66
66
66
66
66
66
66
83
83
83
83
84
AD 728×90

Air Quality Index Trend

6h · 1 stn

Hirai'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 Hirai is 1.3× the WHO 24-hour guideline of 15 µg/m³.

87.1%
Humidity
63.6 km/h
Wind NNW
1002.4 hPa
Pressure
14.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
66
19.44 µg/m³
PM10
44
48.05 µg/m³
050100150200300500

What is the weather forecast for Hirai?

Temperature & Precipitation

PM2.5 Trend

6h · 1 station
PM2.519.44 µg/m³ ×1.3 WHO
Moderate
PM1048.05 µg/m³
Good
UV INDEX14.9
Extreme
AD 300×250
Station readings (43 stations within 25 km)
19.44
Median
17.03
Average
3.8
Low
26.0
High
PM2.5 µg/m³ · Model: 23.15 · Bias: +3.7

What is the 7-day forecast for Hirai?

07-22
29.8° 23.6°
5.38 mm
07-23
28.0° 22.2°
0.75 mm
07-24
28.9° 24.4°
1.06 mm
07-25
31.9° 23.3°
0.06 mm
07-26
30.0° 24.7°
0.19 mm
07-27
32.5° 24.9°
6.06 mm
07-28
29.4° 26.0°
13.88 mm
Both models agree Avg diff: 2.5°C

Where are air quality stations near Hirai?

59
Edogawa (江戸川区)
2.3 km PM2.5: 15.9 µg/m³
63
Ojima, Koto, Tokyo, Japan (江東区大島江東区)
2.6 km PM2.5: 17.8 µg/m³
53
Ojima, Koto, Tokyo, Japan (江東区大島江東区)
2.6 km PM2.5: 13.1 µg/m³
80
スカイツリー１５０ｍ
2.9 km 82.3% RH PM2.5: 26.0 µg/m³ PM10: 44.0 µg/m³
70
スカイツリー３２５ｍ
2.9 km 78.8% RH PM2.5: 21.0 µg/m³ PM10: 36.0 µg/m³
65
Koto (江東区)
4.5 km PM2.5: 18.8 µg/m³
70
Koto (江東区)
4.5 km PM2.5: 21.1 µg/m³
61
Minowa, Taito, Tokyo, Japan (明治通り大関横丁台東区)
4.5 km PM2.5: 16.9 µg/m³
70
Minowa, Taito, Tokyo, Japan (明治通り大関横丁台東区)
4.5 km PM2.5: 21.1 µg/m³
71
Haruecho, Edogawa, Tokyo, Japan (江戸川区春江町江戸川区)
4.8 km PM2.5: 21.6 µg/m³

What cities are near Hirai?

68 Ōjima 67 Katsushika 65 Edogawe 68 Sumida 68 Funabori 67 Ichinoe 69 Asakusa 67 Horikiri 67 Aoto 68 Tōyō
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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 2026-07-22T00:21 UTC.