Worst air pollution Fort Smith National Historic Site - Fort Smith, today and tomorrow
Today (9 August): Air quality in Fort Smith National Historic Site is medium. AQI, NO2, and O3 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 12:00 PM (O3: 57.7/100).
Tomorrow (10 August 2026): Air quality in Fort Smith National Historic Site is fair. PM2.5 increases to fair; PM10 increases to fair; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 11:00 PM (NO2: 40.7/100). Airmine updates local air quality forecasts four times daily.
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Fort Smith National Historic Site, situated at a preserved 19th-century military fort and courthouse, sees the same seasonal air quality swings that shape the rest of Fort Smith. As with most sublevel sites, the broader city trend is the best guide to typical conditions here.
Today - 9 August | Pollution peaks at 12:00
AQI:
Medium
57.7/100
PM2.5 (fine particles):
Good
19.2/100
PM10 (coarse particles):
Good
15.0/100
NO2 (nitrogen dioxide):
Medium
41.4/100
O3 (ozone):
Medium
57.7/100
SO2 (sulfur dioxide):
Good
15.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.0/100
PM1 (ultrafine particles):
Good
15.9/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 23:00
AQI:
Medium
40.7/100
PM2.5 (fine particles):
Fair
21.7/100
PM10 (coarse particles):
Fair
21.0/100
NO2 (nitrogen dioxide):
Medium
40.7/100
O3 (ozone):
Fair
38.8/100
SO2 (sulfur dioxide):
Good
12.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.6/100
PM1 (ultrafine particles):
Good
16.7/100
Other Landmarks in Fort Smith
Frequently Asked Questions
Is air quality bad in Fort Smith National Historic Site right now?
On 9 August 2026, overall air quality in Fort Smith National Historic Site is medium. AQI is the main air quality indicator at 57.7/100. Pollution peaks around 12:00 PM (O3: 57.7/100).
Will air quality be worse tomorrow in Fort Smith National Historic Site?
On 10 August 2026, air quality conditions in Fort Smith National Historic Site will be worse than today, with O3 forecast at fair at 38.8/100. Pollution peaks around 11:00 PM (NO2: 40.7/100).
When is air pollution at its worst in Fort Smith National Historic Site?
Conditions at Fort Smith National Historic Site vary noticeably across the seasons — the cleanest stretches usually come in spring and fall, between the summer ozone season and the calmer winter pollution episodes, whereas prolonged summer heat waves are when air quality most often dips into unhealthy territory. Calm, cold winter spells can occasionally allow local pollution to build up before the next weather system clears it.
Are air quality levels in Fort Smith National Historic Site 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.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 9 August 2026 at 20:27 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.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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