smog in our city is quite an unusual thing, but nevertheless I managed to do this picture. This phenomenon usually occurs before the coming of warm wind called "chinook" - is a Polish equivalent of "halny. Then there is no strong thermal inversion, a layer of cold air is still overwhelmed by warmer air from the top. This entails, any contamination can not escape into the atmosphere and remain until I come warm wind.
We have a pretty good vantage point for these various atmospheric interest (as I wrote already in an earlier post ). A similar phenomenon sometimes observed in August in Zakopane - the mechanism is exactly the same.

And here have other shots of the same phenomenon, only about two months later.

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