Smoke rises from a factory over Skopje, covered by smog and pollution on December 21, 2023. - Skopje recorded an Air Quality Index (AQI) of 173, which is labeled as 'Unhealthy', making the capital city among the 10 most polluted in the world. The levels of toxic PM10 and PM 2.5 particles in the air measured by IQAir in Skopje were about 15 times higher than the safety threshold established by the World Health Organization. (Photo by Robert ATANASOVSKI / AFP)
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