What Do You Know About Radon?

I'll be honest. I don't know much. I know that its the second leading cause of lung cancer in the US behind smoking. Thats about it.

The reason I ask is because apparently there is some in our house that we just bought. We had the home inspector put a monitor in the basement that reads the levels periodically and it came out to an average of 5.5 PCI (with highs in the 13+ category and lows in the 1- category). 5.1 is the tolerable limit from the EPA (I think... I'm a little confused but thats what I think.). In some states the tolerable limit on a house sale is 14 PCI. I can't find any info on Wisconsin's limits however.

In any case, to solve the issue, you just install a mitigation system to vent the soil under your house and the problem goes away (or usually reduces the reading to 2 PCI or lower)! The problem is that its a costly system to install. Where do you draw the line between owning your "dream home" and walking away from a deal because radioactive gases are invading your basement? Its really a no brainer to me... I'm just interested in what everyone else has to say...