Various Topic Articles Are Included Here
There Is So Much EMF In The Air Today, Why Worry About Wifi and Cell Phones ?
NOTE: Radio Frequencies (RF) are part of the broader range called electromagnetic fields (EMF).
The title of this article is a commonly asked question. There are numerous ways to address this subject, such as examination of water or air quality and asking if being complacent about new (water or air) threats of contamination are worth investigating and possibly resisting when it is known that there are already compromises on air or water quality.
Water and air quality issues have been around longer than EMF concerns. As such, it is more difficult for regulators to ignore threats to water or air quality, but the topic of EMF hazards appears to be new enough that they can, or they try to, “shrug it off”.
Manufacturers and Users (such as communications carriers and utility companies) will often use the proliferation of wireless Internet (Wifi) and cell phone usage to attempt to dispel concern for their EMF (RF) base stations or wireless smart meter installations.
Case In Point
There are countless scenarios and settings in which this topic can be discussed, each with it’s own set of assumptions. Here a simple example will be addressed that gives a data point that you might find interesting.
The setting is a community neighborhood. One particular resident is concerned because he is aware that his neighbor uses Wifi, 24 hours per day. He would like his neighbor, at a minimum, to turn off the Wifi overnight. Here we will simply compare the received Power Density (the received field strength) of that Wifi and compare it to the received signal strength of a Cell phone Base Station (aka Cell Tower) that is in the same town. We will assume that the neighbor is right next door.
Calculations are included for the technical readers. If you do not wish to wade through the math, just skip to the Findings.
You can refer to FCC Bulletin OET65 for formulas to compute received Power Density.
Cell Phone Base Station
Assumed base station transmit power: 60 watts
Assumed antenna gain (numeric): 10
Assumed range from cell base station: 2333 meters
Received EMF Power Density: 0.88 Nano Watts/ Sq cm
Wifi Wireless Router
Assumed base station transmit power: 1 watts
Assumed antenna gain (numeric): 4
Assumed range from cell base station: 30 meters
Received EMF Power Density: 35.4 Nano Watts/ Sq cm
Cell Phone Base Station Received EMF Power Density: 0.88 Nano Watts/ Sq cm
Wifi Wireless Router Received EMF Power Density: 35.4 Nano Watts/ Sq cm
The Wifi Received Power Density is (35.4/.88) is 40.2 times stronger than the Cell Phone Base Station radiation.
Due to the very close proximity of the Wifi unit, it (the Wifi unit) has a dramatic effect (increase of EMF strength) on the EMF environment for the concerned person.