Air Quality in Koper, Slovenia
Windy
24.5°C · 46.4% humidity
24.5°
Feels 24.5°
63
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
2 stations
Nearby Monitoring Stations
Koper's air quality — share it
AQI Forecast
Calibrated
52
2pm
52
52
63
5pm
60
58
76
8pm
75
74
73
11pm
73
73
73
2am
43
43
43
5am
43
42
42
8am
42
42
42
11am
42
42
Station readings
57
61
CAMS model
adj +18
34
34
34
34
34
34
54
54
54
54
54
54
54
25
25
25
25
24
24
24
24
24
24
24
Air Quality Index Trend
40h · 1 stnKoper's air quality is shaped by traffic emissions and residential heating. Pollution levels tend to peak during winter months when cold air traps emissions close to ground level. Current PM2.5 concentration in Koper is 1.2× the WHO 24-hour guideline of 15 µg/m³.
46.4%
Humidity
47.5 km/h
Wind ENE
1019.0 hPa
Pressure
4.4
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
17.6 µg/m³
PM10
27.4 µg/m³
050100150200300500
What is the weather forecast for Koper?
Temperature & Precipitation
PM2.5 Trend
40h · 1 stationPM2.517.6 µg/m³
×1.2 WHO
Moderate
PM1027.4 µg/m³
Good
UV INDEX4.4
Moderate
Station readings (2 stations within 25 km)
17.6
Median
17.6
Average
15.0
Low
20.2
High
PM2.5 µg/m³ · Model: 8.2 · Bias: -9.4
What is the 7-day forecast for Koper?
09-05
26.7° 16.3°
09-06
26.7° 16.6°
2.75 mm
09-07
27.8° 15.1°
5.31 mm
09-08
23.7° 16.3°
09-09
25.7° 16.2°
23.31 mm
09-10
30.5° 16.2°
09-11
25.5° 12.9°
11.62 mm
Both models agree
Avg diff: 4.3°C
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-09-05T15:05 UTC.