Radon Map

I found this little number on Wikipedia:

http://upload.wikimedia.org/wikipedia/commons/3/37/Mean_atmospheric_rado...

It gives a heatmap for average Radon readings in different parts of the world.

Our area near SF averages 2-5 Bq/m3 of internal emitting Radon (i.e. you breathe it constantly). Other parts of the country are much higher.

Just something to keep in perspective.