What is PEMF penetrative power and intensity

The intensity of the magnetic field decreases with distance as per the inverse square of the distance law.

The wavelength of the magnetic field is thousands of miles. So generally speaking, magnetic waves are spread everywhere around us, and the fluctuations of the waves from such powerful sources as the Sun or Earth's Core are felt here.

But if we speak about the small, powerful sources of magnetism or PEMF, even if they are as powerful as 100-400 gauss on the surface of the coils or magnets, the intensity goes down significantly and becomes undetectable (same as the natural Earth's magnetic field 50-100 mili Gauss background) several inches above the mat surface.