Worst air pollution Siedlce, today and tomorrow
Today (16 July): Air quality in Siedlce is fair. O3 and PM1 are fair; AQI and NO2 are medium; PM2.5, PM10, SO2, CO, and HCHO are good. Pollution peaks around 11:00 PM (NO2: 42.6/100).
Tomorrow (17 July 2026): Air quality in Siedlce is fair. PM1 decreases to good; all other pollutants stay as today. Pollution peaks around 4:00 AM (NO2: 48.1/100). 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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Siedlce's air quality reflects the flat Mazovian lowland in eastern Poland, with vehicle traffic on the S2 expressway and the surrounding manufacturing and logistics industry contributing local sources. Winter residential wood and coal burning generates seasonal PM2.5 elevation, while the flat Masovian plain generally allows reasonable wind dispersal on most days and Siedlce's position east of Warsaw means it receives relatively less industrial background pollution than the Silesian-influenced central Poland cities.
Today - 16 July | Pollution peaks at 23:00
AQI:
Medium
42.6/100
PM2.5 (fine particles):
Good
19.3/100
PM10 (coarse particles):
Good
5.5/100
NO2 (nitrogen dioxide):
Medium
42.6/100
O3 (ozone):
Fair
29.3/100
SO2 (sulfur dioxide):
Good
8.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.2/100
PM1 (ultrafine particles):
Fair
22.9/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 04:00
AQI:
Medium
48.1/100
PM2.5 (fine particles):
Good
14.4/100
PM10 (coarse particles):
Good
4.6/100
NO2 (nitrogen dioxide):
Medium
48.1/100
O3 (ozone):
Fair
30.1/100
SO2 (sulfur dioxide):
Good
8.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.1/100
PM1 (ultrafine particles):
Good
16.5/100
Pollen forecast in Siedlce
View pollen forecastFrequently Asked Questions
Is air quality bad in Siedlce right now?
On 16 July 2026, overall air quality in Siedlce is fair. O3 is the main pollutant at 29.3/100. Pollution peaks around 11:00 PM (NO2: 42.6/100).
Will air quality be worse tomorrow in Siedlce?
On 17 July 2026, air quality conditions in Siedlce will be similar to today, with O3 forecast at fair at 30.1/100. Pollution peaks around 4:00 AM (NO2: 48.1/100).
When is air pollution at its worst in Siedlce?
Residents in Siedlce are quickest to notice reduced air quality when oak and birch pollen peaks, or due to vehicle traffic on the S2 expressway and the surrounding manufacturing and logistics industry; conditions usually ease once the wet season or windier weather returns.
Are air quality levels in Siedlce 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.
Want to see air quality forecasts for other cities in Poland?
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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