Worst air pollution Usa, today and tomorrow
Today (16 July): Air quality in Usa is medium. AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 4:00 PM (O3: 58.9/100).
Tomorrow (17 July 2026): Air quality in Usa is poor. AQI worsens to poor; O3 increases to poor; HCHO increases to fair; all other pollutants stay as today. Pollution peaks around 3:00 PM (O3: 61.3/100). 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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Usa's air quality benefits from its exceptional Oita Prefecture Nakatsu Bay and Suonada Sea coastal position, with consistent Seto Inland Sea and Pacific maritime breezes providing reliable ventilation. Vehicle traffic on surrounding roads and the Usa Jingu shrine tourism, agricultural, and manufacturing corridor contribute local sources, while the outstanding coastal exposure and the shrine forest setting generally maintain Usa among Oita Prefecture's more moderately ventilated coastal cities throughout most of the year.
Today - 16 July | Pollution peaks at 16:00
AQI:
Medium
58.9/100
PM2.5 (fine particles):
Good
12.4/100
PM10 (coarse particles):
Good
4.6/100
NO2 (nitrogen dioxide):
Good
16.1/100
O3 (ozone):
Medium
58.9/100
SO2 (sulfur dioxide):
Good
5.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
13.3/100
PM1 (ultrafine particles):
Good
14.1/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 15:00
AQI:
Poor
61.3/100
PM2.5 (fine particles):
Good
12.1/100
PM10 (coarse particles):
Good
3.9/100
NO2 (nitrogen dioxide):
Good
19.2/100
O3 (ozone):
Poor
61.3/100
SO2 (sulfur dioxide):
Good
7.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Fair
20.8/100
PM1 (ultrafine particles):
Good
15.9/100
Frequently Asked Questions
Is air quality bad in Usa right now?
On 16 July 2026, overall air quality in Usa is medium. AQI is the main air quality indicator at 58.9/100. Pollution peaks around 4:00 PM (O3: 58.9/100).
Will air quality be worse tomorrow in Usa?
On 17 July 2026, air quality conditions in Usa will be worse than today, with AQI forecast at poor at 61.3/100. Pollution peaks around 3:00 PM (O3: 61.3/100).
When is air pollution at its worst in Usa?
In Usa, road traffic, light manufacturing, together with farming and agricultural processing are the main local sources, with conditions worsening when maritime winds die down. Onshore breezes usually help clear the air, but pollution can build up when winds are light. This natural ventilation is one reason coastal areas often see better readings than inland cities.
Are air quality levels in Usa 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