Worst air pollution Shiroi, today and tomorrow
Today (16 July): Air quality in Shiroi is fair. O3, SO2, and PM1 are fair; AQI and NO2 are medium; PM2.5, PM10, CO, and HCHO are good. Pollution peaks around 11:00 PM (NO2: 40.0/100).
Tomorrow (17 July 2026): Air quality in Shiroi is fair. PM2.5 increases to fair; O3 decreases to good; all other pollutants stay as today. Pollution peaks around 3:00 AM (NO2: 42.9/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Shiroi's air quality reflects the flat Chiba Prefecture Tone River plain position adjacent to Narita Airport's approach paths, with vehicle traffic on surrounding roads and the manufacturing, residential, and aviation background contributing local sources. The flat Kanto Plain allows reasonable dispersal, while the aviation background and summer photochemical ozone from the broader Kanto corridor are the primary air quality concerns and Shiroi generally maintains moderate Tokyo northeastern Chiba suburban readings throughout most of the year.
Today - 16 July | Pollution peaks at 23:00
AQI:
Medium
40.0/100
PM2.5 (fine particles):
Good
19.9/100
PM10 (coarse particles):
Good
5.8/100
NO2 (nitrogen dioxide):
Medium
40.0/100
O3 (ozone):
Fair
28.9/100
SO2 (sulfur dioxide):
Fair
21.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
8.1/100
PM1 (ultrafine particles):
Fair
25.4/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 03:00
AQI:
Medium
42.9/100
PM2.5 (fine particles):
Fair
20.9/100
PM10 (coarse particles):
Good
6.4/100
NO2 (nitrogen dioxide):
Medium
42.9/100
O3 (ozone):
Good
16.0/100
SO2 (sulfur dioxide):
Fair
26.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.4/100
PM1 (ultrafine particles):
Fair
24.1/100
Frequently Asked Questions
Is air quality bad in Shiroi right now?
On 16 July 2026, overall air quality in Shiroi is fair. O3 is the main pollutant at 28.9/100. Pollution peaks around 11:00 PM (NO2: 40.0/100).
Will air quality be worse tomorrow in Shiroi?
On 17 July 2026, air quality conditions in Shiroi will be similar to today, with SO2 forecast at fair at 26.4/100. Pollution peaks around 3:00 AM (NO2: 42.9/100).
When is air pollution at its worst in Shiroi?
Shiroi usually sees its poorest air quality when traffic emissions, military aviation activity, together with steel, cement, and chemical production coincide with periods when hot, still weather settles in. Heat and sunlight combine with emissions to form ozone at ground level. Readings are generally lower during the cooler, cloudier months.
Are air quality levels in Shiroi based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app