From WillowRun's links it's clear that the FCC is well aware of the potential problem, since they are restricting the initial C band cellular to below 3.8 GHz. This allows a clear 400 MHz gap from the air radar band, the same as in Europe.
But this restricts the US cellular band to only 100MHz width, which is unlikely to satisfy their requirement long-term, particularly in cities. In Europe the cellular band starts lower at 3.6 GHz, giving a full 200MHz bandwidth.
As the document states, much more needs to be known about the radar equipment sensitivity to out-of-band signals, but it does seem there is no need for immediate safety concerns.
edit: changed an M to G
Last edited by Sallyann1234; 28th Dec 2021 at 12:01.