WIFI Advisor Noise definition and typical values

What is the definition of the NOISE result in the wireless testing performed by the WIFI Advisor? What are typical values and sources of noise?

Noise is the measure of RF energy, in the selected channel, that is not considered to be from a WIFI device. The value is measured from 0db to -120db and values closer to -120db are better (less noise). Typical noise environments range from -90 to -98db. Potential sources of noise for 2.4GHz Band are: Microwaves, Bluetooth devices, Digital and Analog Baby Monitors, Non-DECT Cordless Phones, Wireless Cameras (mixed frequency video), Zigbee Devices, Wireless audio/video devices, Alarm systems, Harmonics from LCD displays, X10 cameras, Municipal wireless networks, Wireless Gamepads, 2.4GHZ HAM radios, Non-802.11 Wireless Internet Services (like WiMAX), Home RF spread spectrum based network (non-802.11), Outdoor Microwave links, Fluorescent Lights/Bad Ballasts, Bad electrical connections or AC/DC power supplies, Treadmills, Wireless ceiling fan controllers and Garage Door Openers. Potential sources of noise for 5 GHz Band are: Wireless Cameras (mixed frequency video), Alarm Systems, Digital Baby Monitors, Wireless audio/video devices, Radar and Perimeters Sensors.