photon78s When it comes to macbooks, one factor is - apple removed grounding plug as standard, so you have to buy plug extension in order to have grounding. If it is not grounded, then laptop aluminum body during contact with your arms will cause tingling electrical feel. And if you use battery only during a contact as a possible solution, then there was a report that EMF reader picked up exponentially more EMF exposure whilst using battery. So generally grounding when it is possible is a positive thing, since you do not want electric current to flow through your body.
Dirty electricity the most important factor where you are stationary for long time, usually bedroom, and workplace. And to my understanding, even if EMF is lower frequency, it probably has high energy.
And of course WIFI which is set at 30dB maximum as standard now, without even vendors allowing to change it down. I am running my devices at home at 1dB transmit power, and in public spaces 1dB to 3dB. Never had issues, but if you know that dB is exponential measure, this is very significant reduction. Long term effects of staring at a screen very close to transmitter are well documented, from deniers of any effects and those who claim it has clear long term consequences. Just like it was with cigarettes long time ago. So if you do not want to gamble, precautions can be taken, by knowing simple radio propagation rule - inverse square law. Generally with every meter from non directional transmitter which all consumer electronics are, EMF reduces exponentially. My personal sensitivity and test are unquestionable and not placebo. One of the scenarios where I really feel sick just by using my phone for 30 seconds, is - being in a location far away from cell tower, and in smallish closed room, e.g. basement. In this scenario since cell tower is far away, your phone will transmit maximum in order to reach cell tower, and signal will bounce many times from the walls, creating not very nice place for your health. The same goes with travelling in a car with a cell phone, especially using data a lot. But luckily there are now solutions such as EMF blocking clothing, but this is whole new subject.