OMG!!! Get the chickens out of there ASAP. That radon gas is multiplied, compared to how much we humans would inhale. Hopefully you have a basement window to vent to outdoors.Oh! now that you mention it… our basement (where the brooders are) is supposed to be getting work to redo the ventilation for radon… it’s on the higher end of the “safe” zone and supposed to be fine till the guy can come fix the ventilation for it. but maybe it’s way too high for the chicks?