That's a complete myth. 14000 feet is a great place to sample since the biggest contaminent is respiraton by vegetation. In any case there are a dozen other regular locations: 
and that's just one measuring program of several.
The Global Warmists will love this, because all their data is based on contaminated samples taken from the Big Island. This will make their CO2 levels go up even more and they will say it further justifies their computer models.
That's a complete myth. 14000 feet is a great place to sample since the biggest contaminent is respiraton by vegetation. In any case there are a dozen other regular locations: and that's just one measuring program of several.