πόλη, ουρανός, καπνός, σύννεφα, φυσική δομή, ρύπανση, παραγωγή καυσίμων και ηλεκτρικής ενέργειας, βιομηχανία, κίνδυνος, μόλυνση του αέρα, εργοστάσιο
Public Domain
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