Worst air pollution City of Johnstown, today and tomorrow
Today (30 August): Air quality in City of Johnstown is moderate. AQI and NO2 are moderate; O3 is fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 1:00 AM (NO2: 50.7/100).
Tomorrow (31 August 2026): Air quality in City of Johnstown is moderate. O3 decreases to good; all other pollutants stay as today. Pollution peaks around 8:00 PM (NO2: 56.3/100). Airmine updates local air quality forecasts four times daily.
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In City of Johnstown, light traffic leaves farmland activity as the bigger influence on air quality. Nearby trees help filter some of this load before it settles. This baseline can shift a little as weather patterns change. Daily readings shift with weather, time of day, and local activity.
Today - 30 August | Pollution peaks at 01:00
AQI:
Moderate
50.7/100
PM2.5 (fine particles):
Good
5.9/100
PM10 (coarse particles):
Good
1.8/100
NO2 (nitrogen dioxide):
Moderate
50.7/100
O3 (ozone):
Fair
25.0/100
SO2 (sulfur dioxide):
Good
4.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.9/100
PM1 (ultrafine particles):
Good
7.2/100
Levels show the poorest local air quality during the day
Tomorrow - 31 August | Pollution peaks at 20:00
AQI:
Moderate
56.3/100
PM2.5 (fine particles):
Good
10.5/100
PM10 (coarse particles):
Good
3.7/100
NO2 (nitrogen dioxide):
Moderate
56.3/100
O3 (ozone):
Good
19.9/100
SO2 (sulfur dioxide):
Good
4.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.3/100
PM1 (ultrafine particles):
Good
10.1/100
Pollen forecast in City of Johnstown
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in City of Johnstown
Frequently Asked Questions
Is air quality bad in City of Johnstown right now?
On 30 August 2026, overall air quality in City of Johnstown is moderate. AQI is the main air quality indicator at 50.7/100. Pollution peaks around 1:00 AM (NO2: 50.7/100).
Will air quality be worse tomorrow in City of Johnstown?
On 31 August 2026, air quality conditions in City of Johnstown will be similar to today, with AQI forecast at moderate at 56.3/100. Pollution peaks around 8:00 PM (NO2: 56.3/100).
When is air pollution at its worst in City of Johnstown?
Winter is when particulate matter climbs highest, as cold, still air traps heating smoke.. As the weather warms, ozone takes over as the main concern here.. Air quality improves in spring and fall, when wind helps disperse pollutants.
Are air quality levels in City of Johnstown 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: 30 August 2026 at 14:32 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.
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