No one's ever gonna read this but for me those three were very obvious. N - not that many cities have had been the target of a nuclear bomb. O - the building is the one destroyed in Oklahoma bombing. W- look at the all the face masks and the monitors for screening people's body temperature. Q and X though...
For X, I wanted to avoid using repeats from WolfCam's original of this quiz, "A-Z Cities by Picture," which had Xian. Not sure if there is anything else than the skyline of some Chinese city there. Quebec City would have been an interesting idea, though.