I have heard the question many times. I have no answers. I would like to hear from experts.
One good source is the Environmental Health Trust,https://ehtrust.org/
EMF is one of the most-researched topics in the history of public health. The World Health Organization has a lot of info:
Like visible light, EMF (and other radiation) follows the inverse-square law, so moving away from the source rapidly reduces the field strength. An everyday example would be the difference between looking at a camera flash close to your face vs. at a flash from across a room.
EMFs are everywhere and in varying strengths and frequencies. In my experience a small percentage of the population report that they are very sensitive to EMFs (I have a few such clients). This may be similar to some who are very sensitive to air pollutants such s VOCs, mold and other allergens. What we do know it that the effects of electromagnetic radiation varies with the frequency and distance from the source. The frequencies of the microwave region can cook food from the inside out. Frequencies of the mid-infrared band will transfer a lot of thermal energy (such as from the sun) and of course there is the visible light band. EMFs are generally not considered a health risk, unless you spend any significant time close to a source, such as living next to a high voltage power line or (transformer) substation or talking on your cellphone with it next to your ear for extended periods.
We are occasionally requested to test for EMF's in the course of our home inspections. I use a reasonably priced gauss meter and I walk from an area of near-zero reading toward the suspected source/s. I make no interpretation of readings but I have shared pdf research articles with clients who request them. Several of those clients have walked away from their proposed home purchase after seeing the meter max out when it nears the cell tower, high tension lines, transformer, or other EMF source. Being a big believer in the precautionary principle I would do the same thing were I in their situation.