Is that an issue in the UK?

In granite bedrock areas such as Cornwall, yes, radon is a significant concern that requires measurement and usually remediation (extraction fans).

The chalk bedrock in Reading isn't generally susceptible to radon.

hermitcrab an hour ago | parent | prev | next [-]

It is in some areas with a lot of granite, such as Cornwall. I'm not aware it is a factor in Reading.

	▲	wafflemaker an hour ago \| parent [-]
		Granite tends to contain Radon as it's in the decay chain of Uranium, which is often found in Granite.

jvanderbot an hour ago | parent | prev | next [-]

It comes out of the ground. UK has some of that I think.

Tunnels and basements just trap it so it can't blow away.

louthy an hour ago | parent | prev [-]

Very much so.