Free Wi-Fi spots can become a Pollution

Uncontrolled Wi-Fi hotspots can become a pollution, whenever there is an excessive deployment of a number of access points in an area, especially on the same or around a neighborhood channel, can prevent access and interfere with the use of other access points by others, caused by overlapping channels in the 802.11g/b spectrum, as well as with decreased signal-to-noise ratio (SNR) between access points.

This can be a problem in high-density areas, such as large apartment complexes or office buildings with many Wi-Fi access points.

Additionally, other devices using the 2.4 GHz band: microwave ovens, security cameras, Bluetooth devices and (in some countries) Amateur radio, video-senders, cordless phones and baby monitors can cause significant additional interference.

General a guide to those who suffer from these forms of interference or network crowding is to migrate to a WiFi 5 GHz product (802.11a) usually a dual band product as the 5 GHz band is
relatively unused and there are many more channels available. This also requires users to set up the 5 GHz band to be the preferred network in the client and to configure each network band to a different name(SSID).

Excessive free Wifi spots becomes an issue when municipalities or other large entities such as universities, seek to provide large area coverage. Everyone is considered equal for the base standard without 802.11e/WMM when they use the band.

This openness is also important to the success and widespread use of 2.4 GHz Wi-Fi, but makes it unsuitable for "must-have" public service functions or where reliability is required.

Interoperability issues between brands or proprietary deviations from the standard can disrupt connections or lower throughput speeds on other user's devices that are within range. For anyone one seeking to set up a wifi spots must ensure the environment is filled with heavy interferences of broadcasting network which becomes an problem if we really want to liberate our novice friend from the "wifi for dummies domain"