Worst air pollution Walnut Grove - Johnstown, today and tomorrow
Today (30 August): Air quality in Walnut Grove is moderate. AQI and O3 are moderate; NO2 is fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 AM (O3: 41.9/100).
Tomorrow (31 August 2026): Air quality in Walnut Grove is fair. AQI improves to fair; NO2 decreases to good; O3 decreases to fair; all other pollutants stay as today. Pollution peaks around 11:00 AM (O3: 30.1/100). Airmine updates local air quality forecasts four times daily.
Get the full experience in the Airmine app.
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Follow your pollen exposure and performance with the free Airmine–Strava integration. See your pollen and air quality exposure for every Strava activity.
In Walnut Grove, with traffic fairly sparse here, dust kicked up from nearby farmland tends to matter more than vehicle emissions. Tree cover nearby helps soften the local particulate load to a degree. Short-term spikes can occur with unusual weather or nearby construction and traffic events. Broader regional monitoring generally reflects this same baseline, with small local variation.
Today - 30 August | Pollution peaks at 10:00
AQI:
Moderate
41.9/100
PM2.5 (fine particles):
Good
7.4/100
PM10 (coarse particles):
Good
3.1/100
NO2 (nitrogen dioxide):
Fair
20.9/100
O3 (ozone):
Moderate
41.9/100
SO2 (sulfur dioxide):
Good
3.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.3/100
PM1 (ultrafine particles):
Good
4.6/100
Levels show the poorest local air quality during the day
Tomorrow - 31 August | Pollution peaks at 11:00
AQI:
Fair
30.1/100
PM2.5 (fine particles):
Good
9.7/100
PM10 (coarse particles):
Good
5.5/100
NO2 (nitrogen dioxide):
Good
19.1/100
O3 (ozone):
Fair
30.1/100
SO2 (sulfur dioxide):
Good
2.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.1/100
PM1 (ultrafine particles):
Good
6.8/100
Other Landmarks in Johnstown
Frequently Asked Questions
Is air quality bad in Walnut Grove right now?
On 30 August 2026, overall air quality in Walnut Grove is moderate. AQI is the main air quality indicator at 41.9/100. Pollution peaks around 10:00 AM (O3: 41.9/100).
Will air quality be worse tomorrow in Walnut Grove?
On 31 August 2026, air quality conditions in Walnut Grove will be better than today, with AQI forecast at fair at 30.1/100. Pollution peaks around 11:00 AM (O3: 30.1/100).
When is air pollution at its worst in Walnut Grove?
The depths of winter usually mark the low point for local air quality, driven by the combination of home heating and calm winter air that resists mixing. Summer shifts the concern toward ground-level ozone here too, which forms readily in strong sunlight and heat, and can spike further during wildfire smoke events. The transitional months of spring and fall typically see the year's lowest particulate and ozone levels.
Are air quality levels in Walnut Grove 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.
Want to see air quality forecasts for other cities in United States?
Check air quality in other popular cities:
Data provided by Airmine — Last update: 30 August 2026 at 20:26 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.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
Get the full experience in the Airmine app.