I think that mrsD has made an excellent point about the importance of pollutants.

As far as EMF radiation is concerned in the context of WiFi:

In general WiFi comes in two forms.

One is called Ultra High Frequency (UHF) radiation - between 300 MHz and 1 GHz - this is in the radio frequency range - I don't know of any evidence that radio waves are a health risk.

The other is called Super High Frequency (SHF) radiation - between 3 GHz and 30 GHz. SHF is microwave radiation - "heat" in ordinary terms - that is what people experience when they sit in front of a fire or electric heater.

I don't know of any evidence that sitting in front of a fire or electric heater is a health risk.