If you've ever wandered through a city and spotted tiny mini 5G cell towers on street light poles. They look like little boxes however they're actually sending wireless signals from cellular providers to your phone.
The smaller ones are being replaced by the larger specially-designed cell towers. While they're less noticeable but they can still create issues for users.
It is the Federal Communications Commission's Radiation Exposure Thresholds
The FCC's Radiation Exposure Thresholds establish the safe limit at which one can expose to electromagnetic energy generated by wireless devices. The exposure limits are based on scientific data which show that the energy of RF can cause harm to health.
The specific absorption rate (SAR) is a measure of the radiofrequency energy that is absorbed by tissue. It is typically 1.6 watts per kilogram, calculated over one kilogram of tissue.
But, since 5g operates at higher frequencies this could be able to create more energy on the skin and other directly-exposed body areas. This could lead to a wide range of potential harms, including exacerbated the development of skin conditions such as dermatitis, skin cancer and cataracts.
Because of the potentially harmful effects of radiation from 5G, PSU has chosen to create a general limits on power density, which is 4mW/cm2 based on the average on 1cm2, and not to exceed 30 minutes, for the entire 5G spectrum at 3000 GHz. This limit for localization is in line with the highest SAR spatial-average of 1.6 W/kg, which is averaged over 1 g of tissue at 6 GHz.
The FCC's Maximum Exposure Thresholds for Maximum Exposure
If you've ever used a mobile phone, you're probably aware that a safe location from the tower is at least 400 meters away. This is because the power of transmission from the cell tower is significantly increased the further the tower is.
While this sounds like an ideal idea however, people who live close to towers could be more prone to health problems. For example, a study from 2014 in India discovered that people who lived within 50 meters of cell towers had much more health problems than those who were distance from them.
But, the study showed that residents who moved to areas further away from cell towers experienced their symptoms return to normal within a couple of days. Other studies have revealed that exposure to high frequencies of radiofrequency electromagnetic fields (EMFs) can cause brain tumors, cancers, and other health problems.
what is a safe distance from a 5g cell tower is due to the fact that radiofrequency radiation, used in wireless communication, can penetrate the human body's exterior layer, called the skin. It is crucial to know since the skin functions as a protective barrier against injuries caused by mechanical forces, infections caused by pathogenic microorganisms and infiltration of toxic substances. The skin is the biggest organ of the human body and is responsible for protecting other organs.
https://brennan-martensen.hubstack.net/is-there-any-harm-coming-from-5g-1680188340 for the Minimum Exposure

The FCC's Minimum Exposure Thresholds are based on numerous assumptions that are not supported by scientific research. They include the incorrect belief that short-term exposures RF radiation is safe due to the limited absorption into body (i.e., tissue heating).
The assumption also ignores the greater penetration of ELF parts of the modulated RF signal and the consequences of short bursts of heat generated by RF waves that are pulsed. These assumptions are not in line with current understanding of the biological effects of RF radiation. Therefore, they should not be used for health protective exposure standards.
Furthermore, get more info and FCC limit their maximum exposure limits to local peak SARs based on the maximum frequency of absorption (psSAR) which is an inadequate dosimetric tool to assess the amount of exposure to radiofrequency radiation. Particularly the psSAR tool is not accurate when frequencies exceed 6 GHz. Additionally, psSAR hasn't been evaluated for RF radiation exposed to other agents of the environment such like sunlight. The interactions of RF radiations with different environmental agents may cause synergistic or antagonistic effects. This could result in the risk of having adverse health consequences. For example, co-exposure to RF radiation with sunlight may cause an increase in the incidence of developing skin cancer, and may also exacerbate other skin disorders, such as acne.