All of the clouds yesterday were trails from airplanes. Must be terrible for the people who believe in the chemtrails conspiracy.
The image also features the tallest building in Sofia under construction, Sky Fort, which is over 200 meters high.
Chemtrails
Veselin.blog 
That’s a beautiful sky color.
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Interesting observation! Chemtrails remain a hot topic for conspiracy discussions, but most trails are just harmless condensation from airplanes.
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