B Do multiple WiFi devices create areas of high EMR?

[ChrisXenon]

TL;DR Summary

Do they constructively interfere to create local high spots?

I'm thinking in a typical house or office, areas of constructive interference may exist which aggregate the fields of maybe 10 WiFi devices.
Wouldn't this mean the safe power levels stipulated for any single device would be routinely be exceeded? And if so, do we care?

 

[anorlunda]

They are not stationary, so interference will never sit still in one spot.

The simpler answer, is don't worry.

 

[russ_watters]

I'm thinking in a typical house or office, areas of constructive interference may exist which aggregate the fields of maybe 10 WiFi devices.

Sure. When modeling the exposure, the safest assumption would be to assume they are additive (always constructively interfering).

Wouldn't this mean the safe power levels stipulated for any single device would be routinely be exceeded? And if so, do we care?

No. Commercal home/office devices don't operate at power levels anywhere close to the limits. They are several orders of magnitude too weak:
https://www.fcc.gov/general/radio-frequency-safety-0

 

[sophiecentaur]

They are not stationary,

Moreover, the oscillators in all the devices are not phase locked so the resulting phasor addition of a number of sources will only ever give you a random-looking product with an RMS value that's the sum of the source waves; no identifiable peaks and troughs, (un?)fortunately.

 

[ChrisXenon]

Excellent - thank you both.