During the years of the stewardship of Michael Repacholi, the funding of the WHO's EMF project was so secret that even insiders Microwave News didn't 'know' the source, but suspected it was industry.
"Show us the money, Mike" - this stuck in my mind and allowed me to easily find the story.
Nowadays I don't know who funds the WHO on MF, or even if it is separate budget. The biggest contributor to overall funding is Bill Gates, who chips in more than even the US government.
When I used to study them their pronouncements on EMF risks were thoroughly unreliable, or rather reliably misleading and false.