A method, system and program product comprise receiving spectrum data from one or more WiFi communication devices being configured to be operable as observers of transmissions within a frequency band associated with a WiFi communication system. The spectrum data at least comprises signal levels and timing information for WiFi communication signals and non-WiFi signals observed within the frequency band. WiFi interferers are distinguished using at least the signal levels and timing information for the non-WiFi signals. A real-time interference impact on the observed WiFi communication signals for each of the distinguished WIFi interferers is determined.