Worst air pollution Niihama, today and tomorrow
Today (16 July): Air quality in Niihama is poor. AQI and O3 are poor; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 4:00 PM (O3: 68.8/100).
Tomorrow (17 July 2026): Air quality in Niihama is very poor. AQI worsens to very poor; PM2.5 increases to fair; O3 increases to very poor; PM1 increases to fair; all other pollutants stay as today. Pollution peaks around 3:00 PM (O3: 100/100). 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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Niihama's air quality reflects the Ehime Prefecture Seto Inland Sea coastal position adjacent to the Sumitomo Metal Mining complex, with vehicle traffic on surrounding roads and the copper smelting, chemical, and industrial corridor generating elevated heavy metal PM2.5 and SO₂. Consistent Seto Inland Sea maritime breezes provide coastal ventilation, while the Sumitomo copper smelting operations' distinctive heavy metal emissions represent Niihama's most industrially significant air quality contribution and the coastal position generally manages readings on most wind days throughout the year.
Today - 16 July | Pollution peaks at 16:00
AQI:
Poor
68.8/100
PM2.5 (fine particles):
Good
11.2/100
PM10 (coarse particles):
Good
3.8/100
NO2 (nitrogen dioxide):
Good
14.3/100
O3 (ozone):
Poor
68.8/100
SO2 (sulfur dioxide):
Good
6.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
8.5/100
PM1 (ultrafine particles):
Good
12.9/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 15:00
AQI:
Very poor
100/100
PM2.5 (fine particles):
Fair
22.9/100
PM10 (coarse particles):
Good
7.0/100
NO2 (nitrogen dioxide):
Good
16.7/100
O3 (ozone):
Very poor
100/100
SO2 (sulfur dioxide):
Good
9.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
10.9/100
PM1 (ultrafine particles):
Fair
27.8/100
Frequently Asked Questions
Is air quality bad in Niihama right now?
On 16 July 2026, overall air quality in Niihama is poor. AQI is the main air quality indicator at 68.8/100. Pollution peaks around 4:00 PM (O3: 68.8/100).
Will air quality be worse tomorrow in Niihama?
On 17 July 2026, air quality conditions in Niihama will be worse than today, with AQI forecast at very poor at 100/100. Pollution peaks around 3:00 PM (O3: 100/100).
When is air pollution at its worst in Niihama?
Niihama usually sees its poorest air quality when traffic on the surrounding roads, heavy industry such as steel, cement, or petrochemical processing, together with mining operations coincide with periods when dry, windy weather picks up. Strong seasonal winds can lift dust from the surrounding dry terrain and push particulate levels sharply higher. Sea breezes typically keep conditions in check, except during still weather.
Are air quality levels in Niihama 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