An approach for indicating viral safety of enclosed spaces. Absolute humidity (AH) values AHV (AHV1, AHV2, . . . , AHVn) are received from a set of sensors S (S1, S2, . . . , Sn) placed at locations L (L1, L2, . . . , Ln). The received absolute humidity values AHV (AHV1, AHV2, . . . , AHVi, AHVn) are compared to a viral safety safe value to determine a viral safety assessment of one of safe and not safe. An action is performed when the viral safety assessment is not safe.