john wrote:
I've been trouble-shooting for 3 years my radon problem...but just
recently believe the problem is outdoors and not indoors.

I have an electronic radon monitor that updates reading like every 30
minutes...i've had it as well for about 3 years.

Basically I've sealed everything a 100% indoors for the most part...
the foundation was completely sealed of cracks... thick radon plastic
on top...and vinyl flooring on top of that..

I realized when I had the windows closed for an extended period of
time, the radon levels would eventually fall.. (especially during
the winter when the ground is frozen and there is snow
everywhere...like it is right now)
During the Spring, Summer, and Autumn...if I opened the windows...the
radon levels would slowly increase in the house instead of
decrease.... I was pretty baffled by this, so I put the entire
electronic monitor outdoors instead of indoors...and the levels
remained the same or even rose a bit.
This convinced me that the problem is outdoors and not indoors... I
live in the Mountains (Pennsylvania)

And over the 3 year period the numbers generally averaged from 4.0 to
8.0...indoors... but never really got above 9.0 . (currently ,
since the ground is frozen...the indoor level is 1.9)

So my next question is...what to do now ? I even put the electronic
radon monitor outdoors on the 2nd deck (elevated)..and the number
were about the same there as well.

So in general, my outdoor radon levels average around 4.0 to 6.0 for
the most part... (the 8.0 I mentioned above was an indoor reading
dooring the summer)
The house was built in 1992... I bought it in 2005.

any advice is appreciated


I think you're going to find Radon anywhere where granite is near the
surface.

You could move to south Texas, Louisiana, or Florida. It's mud all the way
down.