Worst air pollution Lancaster, today and tomorrow
Today (16 July): Air quality in Lancaster is fair. O3 is fair; AQI and NO2 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:00 PM (NO2: 46.0/100).
Tomorrow (17 July 2026): Air quality in Lancaster is fair. PM2.5 increases to fair; all other pollutants stay as today. Pollution peaks around 12:00 AM (NO2: 40.5/100). 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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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 - 16 July | Pollution peaks at 20:00
AQI:
Medium
46.0/100
PM2.5 (fine particles):
Good
18.5/100
PM10 (coarse particles):
Good
16.9/100
NO2 (nitrogen dioxide):
Medium
46.0/100
O3 (ozone):
Fair
34.1/100
SO2 (sulfur dioxide):
Good
9.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.9/100
PM1 (ultrafine particles):
Good
11.9/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 00:00
AQI:
Medium
40.5/100
PM2.5 (fine particles):
Fair
20.1/100
PM10 (coarse particles):
Good
11.6/100
NO2 (nitrogen dioxide):
Medium
40.5/100
O3 (ozone):
Fair
38.0/100
SO2 (sulfur dioxide):
Good
5.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.6/100
PM1 (ultrafine particles):
Good
12.8/100
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 16 July 2026, overall air quality in Lancaster is fair. O3 is the main pollutant at 34.1/100. Pollution peaks around 8:00 PM (NO2: 46.0/100).
Will air quality be worse tomorrow in Lancaster?
On 17 July 2026, air quality conditions in Lancaster will be similar to today, with O3 forecast at fair at 38.0/100. Pollution peaks around 12:00 AM (NO2: 40.5/100).
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.
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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