Air quality comparison · Turkey, 328 km apart
Istanbul vs İzmir Air quality index (AQI) today
Istanbul has cleaner air than İzmir right now: AQI 76 (Moderate) against 113 (Unhealthy for sensitive groups).
That puts them in different EPA bands, so the health advice differs today. But over the past 7 days, on modeled daily averages, İzmir averaged AQI 59 against 78, and it was the cleaner of the two on 6 of those days. İzmir has lost more forest since 2001. İzmir has more tree cover.
Turkey
AQI 76
Moderate
Cleaner right now
- PM2.5
- 22.6 µg/m³1.5× WHO guideline
- Main pollutant
- PM2.5
- Source
- Ground station
- Reading
- Nov 11, 19:00 local
Turkey
AQI 113
Unhealthy for sensitive groups
Cleaner right now
- PM2.5
- 40.2 µg/m³2.7× WHO guideline
- Main pollutant
- PM2.5
- Source
- Ground station
- Reading
- Nov 11, 19:00 local
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Istanbul76İzmir113
Head to head
Istanbul vs İzmir at a glance
Istanbul is ahead on 4 of 6 measures, and İzmir on 2. The better figure in each row is marked.
| Istanbul | İzmir | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 76 (better) | 113 |
| PM2.5Fine particles, µg/m³. | 22.6 (better) | 40.2 |
| Past week's averageUS AQI, 7 days. | 78 | 59 (better) |
| Forest lost since 2001Within 10 km of the center. | 31 ha (better) | 471 ha |
| Tree coverWithin 2 km of the center. | 9.2% | 9.6% (better) |
| Trees still neededTo reach a healthy canopy. | 56.9K (better) | 70.6K |
Air quality today
What is the air like in Istanbul and İzmir right now?
Istanbul has cleaner air than İzmir right now: AQI 76 (Moderate) against 113 (Unhealthy for sensitive groups). PM2.5 is setting the index in both.
Istanbul's PM2.5 is about 1.5× the WHO's 24-hour guideline of 15 µg/m³. İzmir's PM2.5 is about 2.7× the WHO's 24-hour guideline of 15 µg/m³.
Both readings come from nearby ground stations.
Istanbulİzmir
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).
Istanbul: Ground station · Istanbul (Aksaray), Turkey, 400 m away · median of 8 stations. Data: World Air Quality Index Project, Turkey National Air Quality Monitoring Network (Ulusal Hava Kalitesi İzleme Ağı).
İzmir: Ground station · Konak, Turkey, 1.7 km away · median of 6 stations. Data: World Air Quality Index Project, Turkey National Air Quality Monitoring Network (Ulusal Hava Kalitesi İzleme Ağı).
The past week
Which had cleaner air over the past 7 days?
But over the past 7 days, on modeled daily averages, İzmir averaged AQI 59 against 78, and it was the cleaner of the two on 6 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
- Istanbul1İzmir6
- Average AQI
- Istanbul78İzmir59
- Worst day, AQI
- Istanbul128İzmir85
The daily numbers (7 days)
| Day | Istanbul | İzmir |
|---|---|---|
| Nov 4 | 80 | 54 |
| Nov 5 | 48 | 52 |
| Nov 6 | 56 | 52 |
| Nov 7 | 66 | 53 |
| Nov 8 | 67 | 47 |
| Nov 9 | 104 | 73 |
| Nov 10 | 128 | 85 |
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 Istanbul and İzmir today?
Istanbul (AQI 76, Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
İzmir (AQI 113, Unhealthy for sensitive groups): Sensitive groups should limit long or intense outdoor activity.
Exercise outdoors
- Istanbul
- Fine for most people; unusually sensitive people should take long or hard exercise easier.
- İzmir
- Children, older adults and people with asthma or heart disease should cut down long or hard exercise.
Windows
- Istanbul
- Fine to open; close them if you are sensitive to pollution.
- İzmir
- Close them to keep the outside air out.
Masks
- Istanbul
- Not needed for most people.
- İzmir
- Sensitive groups: an N95 outdoors.
Air purifier
- Istanbul
- Worth running if you are sensitive.
- İzmir
- Run one, especially in bedrooms.
Against everywhere else
How do Istanbul and İzmir compare with the rest of the world?
Right now Istanbul's air is cleaner than 33% of the 5,420 places Airleaf tracks, and İzmir's is cleaner than 18%. Within Turkey, that is 62% and 18% of its 95 measured places.
Cleaner air than…
- Istanbul
- Beats 33%
- İzmir
- Beats 18%
More tree cover than…
- Istanbul
- Beats 19%
- İzmir
- Beats 20%
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, Istanbul or İzmir?
İzmir has lost more: about 471 ha of forest within 10 km of its center from 2001 to 2025, against 31 ha around Istanbul. 88 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: 2019, with 6 ha lost.
Worst year: 2025, with 93 ha lost.
| Istanbul | İzmir | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 31 ha (better) | 471 ha |
| Share of its forestOf what it had in 2000. | 9.8% (better) | 24% |
| Cleared for goodTurned into farms, mines or towns. | 26 ha (better) | 88 ha |
| Recent trend2021–2025 against the five years before. | Too little to call | Too little to call |
| Main known cause | Towns and roads (83%) | Wildfires (42%) |
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.
Istanbul
2017: satellite photo from August 2017 of a 5 × 5 km area in the city center.
İzmir
2017: satellite photo from August 2017 of a 5 × 5 km area about 7 km southeast of the city center.
Trees
Which has more trees, Istanbul or İzmir?
İzmir has more tree cover: 9.6% of the land within 2 km of its center against 9.2% around Istanbul, or about 26,691 trees against 25,145.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| Istanbul | İzmir | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 25.1K | 26.7K (better) |
| Trees still neededTo reach the target. Fewer is better. | 56.9K (better) | 70.6K |
| CO₂ absorbed each yearBy the trees already standing. | 553K kg | 587K kg (better) |
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
Istanbul vs İzmir: your questions answered
Is Istanbul cleaner than İzmir?
On air quality, yes, right now: Istanbul reads AQI 76 against 113, a gap of 37 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, İzmir averaged AQI 59 against 78, and it was the cleaner of the two on 6 of those days.
Is it safe to exercise outdoors in Istanbul and İzmir today?
In Istanbul, at AQI 76: Unusually sensitive people should consider limiting long outdoor exertion. In İzmir, at AQI 113: Sensitive groups should limit long or intense outdoor activity.
Which has lost more forest, Istanbul or İzmir?
İzmir has lost more: about 471 ha of forest within 10 km of its center from 2001 to 2025, against 31 ha around Istanbul. 88 ha of that was cleared for good, for farms, mines or towns.
Which has more trees, Istanbul or İzmir?
İzmir has more tree cover: 9.6% of the land within 2 km of its center against 9.2% around Istanbul, or about 26,691 trees against 25,145. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do Istanbul and İzmir need?
Istanbul needs about 56,850 more to reach its canopy target of 30%, and İzmir about 70,620 to reach 35%. The target starts at 30% of the land and rises where air quality is poor.
Are Istanbul and İzmir 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 Istanbul vs İzmir 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 12, 2026 and Sep 18, 2026), and the forest figures are published yearly.
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