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Air Quality Data provided by the Turkey National Air Quality Monitoring Network (Ulusal Hava Kalitesi İzleme Ağı) (sim.csb.gov.tr)
Note that the measurements for PM2.5 (тонкодисперсных частиц) and O3 (озон) are taken from the station Kocaeli and the measurement for and CO (окись углерода) are taken from the station Kocaeli Izmit