καπνός, εργοστάσιο, καμινάδα, φυσική δομή, βιομηχανία, ρύπανση, ατμός, παραγωγή καυσίμων και ηλεκτρικής ενέργειας, περιβάλλον, σύννεφο, ουρανός
Public Domain
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