Worst air pollution Cluj-Napoca, today and tomorrow
Today (16 July): Air quality in Cluj-Napoca is fair. O3 is fair; AQI and NO2 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 5:00 AM (NO2: 42.5/100).
Tomorrow (17 July 2026): Air quality in Cluj-Napoca is fair. All pollutants stay as today. Pollution peaks around 3:00 AM (NO2: 43.8/100). 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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Cluj-Napoca's air quality reflects its position in the enclosed Someșul Mic river valley in the Transylvanian plateau, with vehicle traffic on the A3 Transylvania motorway and residential wood and coal burning generating elevated PM2.5 and NO₂. The surrounding Apuseni Mountains and Transylvanian plateau ridgelines create topographic variation, while winter temperature inversions in the valley can concentrate emissions under calm anticyclonic conditions in Romania's rapidly growing second city.
Today - 16 July | Pollution peaks at 05:00
AQI:
Medium
42.5/100
PM2.5 (fine particles):
Good
7.5/100
PM10 (coarse particles):
Good
3.1/100
NO2 (nitrogen dioxide):
Medium
42.5/100
O3 (ozone):
Fair
38.6/100
SO2 (sulfur dioxide):
Good
4.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.5/100
PM1 (ultrafine particles):
Good
9.6/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 03:00
AQI:
Medium
43.8/100
PM2.5 (fine particles):
Good
13.0/100
PM10 (coarse particles):
Good
3.9/100
NO2 (nitrogen dioxide):
Medium
43.8/100
O3 (ozone):
Fair
37.3/100
SO2 (sulfur dioxide):
Good
2.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.2/100
PM1 (ultrafine particles):
Good
17.5/100
Pollen forecast in Cluj-Napoca
View pollen forecastFrequently Asked Questions
Is air quality bad in Cluj-Napoca right now?
On 16 July 2026, overall air quality in Cluj-Napoca is fair. O3 is the main pollutant at 38.6/100. Pollution peaks around 5:00 AM (NO2: 42.5/100).
Will air quality be worse tomorrow in Cluj-Napoca?
On 17 July 2026, air quality conditions in Cluj-Napoca will be similar to today, with O3 forecast at fair at 37.3/100. Pollution peaks around 3:00 AM (NO2: 43.8/100).
When is air pollution at its worst in Cluj-Napoca?
Reduced air quality in Cluj-Napoca is most likely when oak and birch pollen peaks, alongside periods of vehicle traffic on the A3 Transylvania motorway and residential wood and coal burning; the rest of the calendar year is generally more forgiving for air quality.
Are air quality levels in Cluj-Napoca 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