From PBS Eons.

Pretty bad I bet, but how was their sense of smell?

Produced by Complexly for PBS Digital Studios

References:
https://www.cell.com/iscience/fulltext/S2589-0042(22)02181-2?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS2589004222021812%3Fshowall%3Dtrue#secsectitle0065
https://phys.org/news/2023-01-ancient-humans-sensitivities.htm