Worst air pollution Lancaster, today and tomorrow
Today (20 September): Air quality in Lancaster is moderate. AQI and NO2 are moderate; PM2.5 and O3 are fair; PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 6:00 PM (NO2: 45.5/100).
Tomorrow (21 September 2026): Air quality in Lancaster is moderate. All pollutants stay as today. Pollution peaks around 2:00 PM (NO2: 47.2/100). Airmine updates local air quality forecasts four times daily.
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Lancaster's air quality in Pennsylvania reflects the Lancaster Valley's agricultural plain position in the mid-Atlantic corridor, with vehicle emissions from US-30 and the Lancaster Pike combining with ammonia and dust from the dense Lancaster County dairy and poultry farming operations contributing to elevated secondary particulate formation. The broader mid-Atlantic regional airshed contributes summer ozone, while the valley's flat floor allows reasonable wind dispersal on most days.
Today - 20 September | Pollution peaks at 18:00
AQI:
Moderate
45.5/100
PM2.5 (fine particles):
Fair
20.4/100
PM10 (coarse particles):
Good
14.6/100
NO2 (nitrogen dioxide):
Moderate
45.5/100
O3 (ozone):
Fair
22.6/100
SO2 (sulfur dioxide):
Good
2.0/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
3.1/100
PM1 (ultrafine particles):
Good
10.8/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 14:00
AQI:
Moderate
47.2/100
PM2.5 (fine particles):
Fair
20.0/100
PM10 (coarse particles):
Good
13.3/100
NO2 (nitrogen dioxide):
Moderate
47.2/100
O3 (ozone):
Fair
25.7/100
SO2 (sulfur dioxide):
Good
2.3/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
4.0/100
PM1 (ultrafine particles):
Good
9.0/100
Pollen forecast in Lancaster
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Lancaster
Frequently Asked Questions
Is air quality bad in Lancaster right now?
On 20 September 2026, overall air quality in Lancaster is moderate. AQI is the main air quality indicator at 45.5/100. Pollution peaks around 6:00 PM (NO2: 45.5/100).
Will air quality be worse tomorrow in Lancaster?
On 21 September 2026, air quality conditions in Lancaster will be similar to today, with AQI forecast at moderate at 47.2/100. Pollution peaks around 2:00 PM (NO2: 47.2/100).
When is air pollution at its worst in Lancaster?
Lancaster's air quality has a clear seasonal rhythm: once summer ozone season ends, winter typically offers the cleanest air, but hot, humid summer conditions and regional haze drive ozone spikes, especially during heat waves. Dense urban traffic corridors add a persistent background level of pollution that varies less by season than ozone does.
Are air quality levels in Lancaster 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: 20 September 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.
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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