Turkey Air Quality Index (AQI) 2024
Turkey sits at the crossroads of Europe and Asia, with air quality challenges shaped by rapid industrialization, a coal-heavy energy sector, and geography that traps pollution over major cities. Istanbul, Bursa, and Ankara are the most affected; Izmir enjoys cleaner air thanks to Aegean sea breezes.
AQI by City
| City | Avg AQI | PM2.5 (μg/m³) | Population | Key Factor |
|---|---|---|---|---|
| Istanbul | 72 | 22 | 15.8M | Marmara Basin trap, 16M vehicles |
| Ankara | 68 | 20 | 5.7M | High altitude, coal heating |
| Izmir | 55 | 14 | 4.4M | Aegean sea breezes help |
| Bursa | 82 | 25 | 3.1M | Industry + Uludağ valley |
| Adana | 65 | 18 | 2.2M | Cotton dust + traffic |
Sources: IQAir 2024, Turkish State Meteorological Service (MGM), WHO Global Air Quality Database
Main Pollution Sources
Coal Power Plants
Turkey operates ~50 coal power plants, many near populated areas. Coal generates ~35% of electricity. Afşin-Elbistan complex in Kahramanmaraş is one of Europe's largest coal plants. Government coal expansion continues despite EU pressure, given energy security concerns.
Vehicle Fleet (16M+ in Istanbul)
Turkey has ~25 million registered vehicles nationally, with ~16 million in the Istanbul metro. Average fleet age is 13 years — significantly older than EU averages. Older diesel trucks and buses without modern filters are a major NO2 and PM2.5 source on urban corridors.
Residential Heating
Despite natural gas expansion, many lower-income areas and rural towns still burn coal, wood, or biomass for heating. Istanbul's illegal coal/wood burning in peripheral districts contributes significantly to winter PM2.5 spikes during cold high-pressure episodes.
Shipping (Bosphorus)
Over 50,000 ships transit the Bosphorus Strait annually — one of the world's busiest waterways. High-sulfur marine fuel emissions contribute NOx, SO2, and ultrafine particles to Istanbul's coastal areas. Turkey is not yet fully aligned with IMO 2020 fuel sulfur limits enforcement.
The Marmara Basin Effect
Istanbul's unique geography creates a pollution trap. The city sits within the Marmara Basin — surrounded by the Istranca Mountains to the north (Thrace side) and the hills of Anatolia to the south. During winter, high-pressure systems bring cold, stagnant air that pools in the basin. Emissions from traffic, heating, and industry are trapped under a temperature inversion layer, unable to disperse vertically.
These inversion episodes typically last 2–5 days and drive PM2.5 concentrations above 50 μg/m³ (AQI 130+). They are most frequent from November through February. Strong southwesterly winds from the Aegean (lodos winds) quickly clear the basin, providing temporary relief.
Seasonal Air Quality Guide
Turkey vs Global PM2.5 Standards
| Standard | Annual PM2.5 Limit | Istanbul Status |
|---|---|---|
| WHO Guideline | 5 μg/m³ | ❌ 4.4× over (22 μg/m³) |
| EU Standard (current) | 25 μg/m³ | ✅ Below EU limit |
| EU Standard (2030 target) | 10 μg/m³ | ❌ 2.2× over |
| Turkey National Limit | 25 μg/m³ | ✅ Meets own standard |
| US EPA Standard | 9 μg/m³ (2024) | ❌ 2.4× over |
Istanbul Deep Dive
For detailed monthly AQI data, pollution source breakdown, and a practical health guide for Istanbul residents and visitors:
Istanbul AQI Guide →