Worst air pollution Zalău, today and tomorrow
Today (16 July): Air quality in Zalău is poor. AQI and NO2 are poor; O3 is fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 5:00 AM (NO2: 63.1/100).
Tomorrow (17 July 2026): Air quality in Zalău is fair. AQI improves to medium; NO2 decreases to medium; all other pollutants stay as today. Pollution peaks around 5:00 AM (NO2: 53.5/100). 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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Zalău's air quality reflects the Sălaj river valley in the Meseș Mountains foothills of northwestern Romania, with vehicle traffic on the E81 and surrounding manufacturing and agricultural industry contributing local sources. Winter residential wood and coal burning generates elevated PM2.5, while the surrounding Carpathian foothills create topographic variation and cold valley inversions concentrate heating and vehicle emissions during winter anticyclonic periods in this northwestern Romanian regional city.
Today - 16 July | Pollution peaks at 05:00
AQI:
Poor
63.1/100
PM2.5 (fine particles):
Good
13.2/100
PM10 (coarse particles):
Good
6.5/100
NO2 (nitrogen dioxide):
Poor
63.1/100
O3 (ozone):
Fair
34.3/100
SO2 (sulfur dioxide):
Good
4.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.9/100
PM1 (ultrafine particles):
Good
14.7/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 05:00
AQI:
Medium
53.5/100
PM2.5 (fine particles):
Good
11.8/100
PM10 (coarse particles):
Good
4.3/100
NO2 (nitrogen dioxide):
Medium
53.5/100
O3 (ozone):
Fair
33.8/100
SO2 (sulfur dioxide):
Good
5.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.1/100
PM1 (ultrafine particles):
Good
15.4/100
Pollen forecast in Zalău
View pollen forecastFrequently Asked Questions
Is air quality bad in Zalău right now?
On 16 July 2026, overall air quality in Zalău is poor. AQI is the main air quality indicator at 63.1/100. Pollution peaks around 5:00 AM (NO2: 63.1/100).
Will air quality be worse tomorrow in Zalău?
On 17 July 2026, air quality conditions in Zalău will be better than today, with O3 forecast at fair at 33.8/100. Pollution peaks around 5:00 AM (NO2: 53.5/100).
When is air pollution at its worst in Zalău?
Zalău residents notice reduced air quality mainly when oak and birch pollen peaks, and during spells of vehicle traffic on the E81 and nearby manufacturing and agricultural industry; the rest of the calendar year typically brings clearer, more consistent conditions.
Are air quality levels in Zalău 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 Romania?
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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