Cement floor Coop and STINK!
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Agreed, how much ventilation does your coop have?
These are the "windows"
I should say this wall is temporary. Soon they will have access to a floor pop door. Right now I carry them out to free range during the day.
You need ventilation at the floor level, where the ammonia builds. Fresh air in at the bottom, moves the ammonia upward and out the top. If you can't provide that, then cross ventilation at the top, opposite your present openings and also some roof vents...right now you have ventilation that flows one way and it's too high from the source of the fumes.