Air quality comparison · Slovenia, 104 km apart
Ljubljana vs Maribor Air quality index (AQI) today
Ljubljana has cleaner air than Maribor right now: AQI 53 (Moderate) against 54 (Moderate).
Both sit in the same EPA band, so the health advice is the same for each today. But over the past 7 days, on modeled daily averages, Maribor averaged AQI 82 against 88, and it was the cleaner of the two on 5 of those days. Ljubljana has lost more forest since 2001. Ljubljana has more tree cover.
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Ljubljana53Maribor54
Head to head
Ljubljana vs Maribor at a glance
Ljubljana is ahead on 4 of 6 measures, and Maribor on 2. The better figure in each row is marked.
| Ljubljana | Maribor | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 53 (better) | 54 |
| PM2.5Fine particles, µg/m³. | 10.2 (better) | 10.9 |
| Past week's averageUS AQI, 7 days. | 88 | 82 (better) |
| Forest lost since 2001Within 10 km of the center. | 387 ha | 285 ha (better) |
| Tree coverWithin 2 km of the center. | 38.1% (better) | 27.1% |
| Trees still neededTo reach a healthy canopy. | 0 (better) | 8.7K |
Air quality today
What is the air like in Ljubljana and Maribor right now?
Ljubljana has cleaner air than Maribor right now: AQI 53 (Moderate) against 54 (Moderate). PM2.5 is setting the index in both.
Both readings come from nearby ground stations.
LjubljanaMaribor
Concentrations at the same moment as the index above, for the pollutants both places report. Lower is better. The dark marks on the PM2.5 and PM10 rows show the WHO's 24-hour guidelines (15 and 45 µg/m³).
The past week
Which had cleaner air over the past 7 days?
But over the past 7 days, on modeled daily averages, Maribor averaged AQI 82 against 88, and it was the cleaner of the two on 5 of those days. A single reading can catch a city on a bad afternoon; the week says whether it was the weather or the place.
- Cleaner days
- Ljubljana2Maribor5
- Average AQI
- Ljubljana88Maribor82
- Worst day, AQI
- Ljubljana111Maribor92
The daily numbers (7 days)
| Day | Ljubljana | Maribor |
|---|---|---|
| Nov 4 | 68 | 69 |
| Nov 5 | 83 | 82 |
| Nov 6 | 91 | 90 |
| Nov 7 | 79 | 88 |
| Nov 8 | 97 | 88 |
| Nov 9 | 111 | 92 |
| Nov 10 | 88 | 67 |
Daily averages from the CAMS atmospheric model for both places, so the week compares like with like. They can differ from today's reading at the top of the page wherever that comes from a ground station.
What it means today
Is it safe to go outside in Ljubljana and Maribor today?
Unusually sensitive people should consider limiting long outdoor exertion. Both are in the same EPA band today (Moderate), so the advice is the same.
Exercise outdoors
Fine for most people; unusually sensitive people should take long or hard exercise easier.
Windows
Fine to open; close them if you are sensitive to pollution.
Masks
Not needed for most people.
Air purifier
Worth running if you are sensitive.
Against everywhere else
How do Ljubljana and Maribor compare with the rest of the world?
Right now Ljubljana's air is cleaner than 57% of the 5,420 places Airleaf tracks, and Maribor's is cleaner than 56%. Within Slovenia, that is 50% and 25% of its 5 measured places.
Cleaner air than…
- Ljubljana
- Beats 57%
- Maribor
- Beats 56%
More tree cover than…
- Ljubljana
- Beats 81%
- Maribor
- Beats 62%
Includes model estimates as well as station readings, so it can differ from our most polluted and cleanest air rankings, which use station readings only.
Deforestation · 2001–2025
Which has lost more forest, Ljubljana or Maribor?
Ljubljana has lost more: about 387 ha of forest within 10 km of its center from 2001 to 2025, against 285 ha around Maribor. 81 ha of that was cleared for good, for farms, mines or towns.
Measured within 10 km of each center, from the yearly satellite maps of forest loss: a wider circle than the one for tree cover, because forest is usually lost at a city's edges.
Worst year: 2014, with 116 ha lost.
Worst year: 2005, with 33 ha lost.
| Ljubljana | Maribor | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 387 ha | 285 ha (better) |
| Share of its forestOf what it had in 2000. | 3.4% | 2.2% (better) |
| Cleared for goodTurned into farms, mines or towns. | 81 ha (better) | 83 ha |
| Recent trend2021–2025 against the five years before. | Too little to call | Too little to call |
| Main known cause | Logging (75%) | Logging (62%) |
Satellite timelapses
Watch both change, year by year
A clear satellite photo a year of the land around each city. Press play, turn on the forest cleared since the first year, or drag the before and after.
Ljubljana
2017: satellite photo from August 2017 of a 5 × 5 km area about 7 km northeast of the city center.
Maribor
2017: satellite photo from August 2017 of a 5 × 5 km area about 7 km southwest of the city center.
Trees
Which has more trees, Ljubljana or Maribor?
Ljubljana has more tree cover: 38.1% of the land within 2 km of its center against 27.1% around Maribor, or about 119,575 trees against 81,476.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| Ljubljana | Maribor | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 120K (better) | 81.5K |
| Trees still neededTo reach the target. Fewer is better. | 0 (better) | 8.7K |
| CO₂ absorbed each yearBy the trees already standing. | 2.6M kg (better) | 1.8M kg |
Tree cover on the satellite image
The same 2 km radius around each center, with the tree cover the satellite found marked on it.
Reading these numbers
How this comparison is made
Air quality index
The US EPA index, computed from current pollutant concentrations: ground stations where a place has them nearby, and the CAMS atmospheric model everywhere else. It moves hour to hour, so it is a snapshot rather than a verdict on either place. The guideline marks are from the WHO's 2021 air quality guidelines.
Trees and forest
Tree cover is the share of ground under canopy within 2 km of each center, read from Sentinel-2 satellite imagery at 10 m detail. It measures that circle, not the whole municipality, which is what makes the two comparable. Forest loss comes from the University of Maryland's Global Forest Change maps.
More on the method on the About Airleaf page.
Frequently asked
Ljubljana vs Maribor: your questions answered
Is Ljubljana cleaner than Maribor?
On air quality, yes, right now: Ljubljana reads AQI 53 against 54, a gap of 1 points on the US EPA index. This is a live reading rather than an annual average, so it can reverse within a day. But over the past 7 days, on modeled daily averages, Maribor averaged AQI 82 against 88, and it was the cleaner of the two on 5 of those days.
Is it safe to exercise outdoors in Ljubljana and Maribor today?
The advice is the same for both today. Unusually sensitive people should consider limiting long outdoor exertion. Ljubljana reads AQI 53 and Maribor reads AQI 54.
Which has lost more forest, Ljubljana or Maribor?
Ljubljana has lost more: about 387 ha of forest within 10 km of its center from 2001 to 2025, against 285 ha around Maribor. 81 ha of that was cleared for good, for farms, mines or towns.
Which has more trees, Ljubljana or Maribor?
Ljubljana has more tree cover: 38.1% of the land within 2 km of its center against 27.1% around Maribor, or about 119,575 trees against 81,476. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do Ljubljana and Maribor need?
Ljubljana needs about 0 more to reach its canopy target of 30%, and Maribor about 8,719 to reach 30%. The target starts at 30% of the land and rises where air quality is poor.
Are Ljubljana and Maribor measured the same way?
The method is the same: the US EPA index for air, and Sentinel-2 satellite imagery at 10 m detail over an identical radius for trees. Both readings come from nearby ground stations. Nothing is adjusted for population, city limits or climate.
How often does the Ljubljana vs Maribor comparison update?
The air readings refresh about once an hour, and each reading's local time is shown at the top of the page. Tree cover comes from the latest clear satellite image of each area (Sep 16, 2026 and Sep 16, 2026), and the forest figures are published yearly.
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