It depends on how you define "near". In general you can say, that the exposition of electrical and magnetical fields highly decrease with the distance to the transmission line. The emission of fields depends significant on the design of the transmission line as well as on the operating state (e.g. line flow). As an roughly example, the emission (electrical field) of a 220 kV transmission line decreases within 50 m vertical to the line from 2kV/m to 0.2 kV/m. In Germany, the limit for the permanent exposition of electrical fields with frequency around 50Hz is 5kV/m. As electrical fields can be shield e.g. by the walls of your house, electrical fields emitted by innerhouse (consumer) electronics are often higher.
Furthermore, as magnectic fields can not be shield easily there is a ongoing discussion on health impact. However, even close to the transmission line the limits often will not be reached.
I have to say, I'm not an expert in this topic.I only summarize results from different studies.
If you look for health impacts you can try to translate this short document from RTWH Aachen:
https://www.netzausbau.de/SharedDocs/Downloads/DE/2013/FemuFachstellungnahme.pdf?__blob=publicationFile
In Croatia these are permisible levels for 50 Hz:
The permissible level for personnel who fall within the category of professional exposure (8 hrs/day) is Eg8h= 5kV/m.
The permissible level for the electric field in the case of enhanced sensitivity (24hrs/day). Eg24h = 2 kV/m
The permissible level for the magnetic density (B) in the case of enhanced sensitivity (24 hours/day) is Bg24h = 40 μT.
The permissible level for the magnetic density (B) for personnel who fall within the category of professional exposure (8 hrs/day) is Bg8h = 100 μT.
Designed H.V transmission towers are taking care of human/Residential safety considering the area bad weather and sag(minimum distance from ground), though due to Ozone(Corona) formation and reduced air pollution might be faverable to human health, than the bad effect of weak magnetic and electric field exposers, taken care by designed hight of towers.......
You can find many medical study about effects of E and B on the cancer. There are some indication but not relavant evidence. Some experiments where performed with animals (rats and mouses) in which they were exposed to high density magnetic field (B) and results shaws deformation in cell structure on animals. But it is question for medical experts?
The codes and standards ensure safety factors and will not harm human/wild life
The subject was debated in great detail in the sixtees and seventtes when UHV was introduced and the design of towers and clearances do take care of the field levels. For maintenance staff in s/s ,exposure hours are defined. For near by habitation, noise near substation or audible corona could cause irritation and health hazard more than the field. Low clouds over HVDC lines or ion migrations in UHV lines could cause flash overs and noise giving a scare to people staying around , but no health hazard reported.
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