2 is not bad at all, I wouldn't worry about it. Above 4 I'd get concerned. Mine was over 6 Yeah, I forked over the cash.Regarding radon - reference EPA site
Health Risk of Radon | US EPA
Radon is abundant in my area of Massachusetts. It's just something you have to deal with here. I've seen a bunch of different methods of handling radon in RE transactions. It just comes down to the tested levels and whether or not you care enough. My finished basement currently tests at 2 pCi/L and I'm 50/50 on whether or not to install a mitigation system. I'll probably eventually get one but haven't been motivated enough. Every time I feel like blowing $1500 a new shiny gun somehow ends up in my safe.