Does the 5G frequency spectrum really go to 100 GHz?

The consortium responsible for this has plans up to about 80 GHz so far. However, the uppermost frequency bands are only suitable for transmission in the immediate vicinity, for example from computer to screen. In this respect, this uppermost frequency range is not so relevant for electro-sensitive people, because it is up to the user to decide whether to use such applications or not (if 5G in this frequency spectrum should be commercially available in a few years).
The planning for 5G in the frequency range around 28 GHz is much more concrete, where the main focus is on (temporary) coverage of, for example, football stadiums, shopping centres and the like, and on wireless Internet on railway lines and in public transport. Here, too, the range is very limited and in order to minimise power consumption, the suppliers will try to concentrate the radiation as closely as possible to the area that is absolutely necessary. However, the demonstrations so far have revealed major technical difficulties, because even a tree blocking the direct line of sight to the transmitter led to considerable reductions in the transmission rate, even to connection interruptions.

At which frequencies does 5G transmit?

The frequency bands planned today are:
Around 700 MHz.
at 2 GHz
between 3 and 4 GHz (also worldwide at least below 6 GHz, "Sub 6 GHz Band")
around 28/30 GHz
up to about 80 GHz
The large gap between 4 GHz and 28 GHz is striking. The only radio services relevant to building biology in this area are the "5 GHz WLAN" (between 5 and 6 GHz) and a wide range of radar frequencies between 8.5 and 9.5 GHz.

Are 5G frequencies above 30 GHz particularly harmful?

This is what the experts are arguing about, as well as the issue of the harmfulness of electrosmog in general. Just think of the decades of discussion about the harmfulness of asbestos! Here, a precautionary minimization of personal exposure to 5G radiation seems to make sense. The following, physically unquestionable connection is reassuring: The higher the frequency, the less the radiation propagation, or in other words: The higher the frequency, the higher the attenuation of the 5G radiation (of any HF radiation!) alone through the air or the more through common building materials such as stone, wood or glass. In this respect, interiors, i.e. apartments or houses, already offer quite good protection with regard to the higher 5G frequencies.
Why are the 5G frequencies below 6 GHz particularly critical?
From a building biology point of view, it is particularly important to keep the electrosmog load in sleeping areas low, because the organism should be free of external stress during sleep in order to regenerate.
For technical and commercial reasons, however, it is precisely these lower 5G mobile radio frequencies that will lead to increased exposure to 5G radiation in sleeping areas. This is because lower frequencies have a higher transmission range and better penetration of common building materials for the same energy expenditure. This means for the mobile phone provider: With largely the same infrastructure costs, more customers can be covered, i.e. higher profits can be achieved. The same phenomenon is known from the significantly better area coverage of the lower mobile radio bands compared to the upper ones, for example in mobile radio (900 MHz compared to 1800 MHz for GSM, as well as 800 MHz compared to 1800 MHz compared to 2700 MHz for LTE) or 2.4 GHz WLAN compared to 5 GHz WLAN.
While the 700 MHz are thus particularly recommended for rural areas and smaller towns, the newly auctioned frequency bands between 3 and 4 GHz will be used more frequently, especially in inner-city locations, in favor of higher data rates. Even if this requires more transmitting equipment to be set up at closer distances. This is one of the main criticisms of opponents of the 5G expansion.

Why does the market launch of 5G start with the lower frequencies?

Physical laws also apply to 5G, and hardware vendors react to this in a predictable manner: First, there's the greater attenuation of high frequency radiation through the air. From a provider's perspective, "greater attenuation" is synonymous with "more energy input and higher costs" - the commercial consequence: the lowest possible frequency band is always preferred (as is already the case with GSM, LTE and WLAN). The upper 5G bands up to over 50 GHz will thus remain reserved for very short distances with direct line-of-sight connections in the long term - a positive side effect for the population: their own four walls offer comparatively good protection.
The sarcastic phrase "Money makes the world go round" is of benefit to the general population as an exception and rather incidentally ... a small consolation in view of the even higher total RF exposure with 5G.