Worst air pollution Sliven, today and tomorrow
Today (16 July): Air quality in Sliven is fair. O3 and HCHO are fair; AQI and NO2 are medium; PM2.5, PM10, SO2, CO, and PM1 are good. Pollution peaks around 3:00 AM (NO2: 42.4/100).
Tomorrow (17 July 2026): Air quality in Sliven is fair. HCHO decreases to good; all other pollutants stay as today. Pollution peaks around 1:00 AM (NO2: 40.2/100). 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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Sliven's air quality faces significant winter challenges in the southern Balkan foothills, with the surrounding Balkan Mountains creating topographic enclosure that concentrates residential coal burning and vehicle traffic on the E773 under frequent temperature inversions. The Tundja river valley provides limited ventilation, while summer conditions are considerably better with highland breezes providing reasonable natural ventilation.
Today - 16 July | Pollution peaks at 03:00
AQI:
Medium
42.4/100
PM2.5 (fine particles):
Good
11.5/100
PM10 (coarse particles):
Good
3.1/100
NO2 (nitrogen dioxide):
Medium
42.4/100
O3 (ozone):
Fair
31.8/100
SO2 (sulfur dioxide):
Good
5.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Fair
20.2/100
PM1 (ultrafine particles):
Good
15.5/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 01:00
AQI:
Medium
40.2/100
PM2.5 (fine particles):
Good
11.5/100
PM10 (coarse particles):
Good
3.5/100
NO2 (nitrogen dioxide):
Medium
40.2/100
O3 (ozone):
Fair
35.3/100
SO2 (sulfur dioxide):
Good
5.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
17.4/100
PM1 (ultrafine particles):
Good
14.6/100
Pollen forecast in Sliven
View pollen forecastFrequently Asked Questions
Is air quality bad in Sliven right now?
On 16 July 2026, overall air quality in Sliven is fair. O3 is the main pollutant at 31.8/100. Pollution peaks around 3:00 AM (NO2: 42.4/100).
Will air quality be worse tomorrow in Sliven?
On 17 July 2026, air quality conditions in Sliven will be similar to today, with O3 forecast at fair at 35.3/100. Pollution peaks around 1:00 AM (NO2: 40.2/100).
When is air pollution at its worst in Sliven?
Sliven residents notice reduced air quality mainly when linden and acacia pollen peaks, and during spells of the neighbouring Balkan Mountains; conditions usually ease once the wet season or windier weather returns.
Are air quality levels in Sliven 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 Bulgaria?
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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