Fig. 2
From: Economic valuation of health benefits from using geologic data to communicate radon risk potential
Example of newly developed map showing radon danger levels based on home testing and geologic data in the state of Kentucky, USA to illustrate radon risk potential. Radon levels by rock type (pCi/L) ranged from 0.0–2.7 (blue), 2.71–4.0 (green), 4.01–8.0 (yellow), 8.01–16.00 (brown), 16.01–25.30 (red). Image produced and used with permission from the Kentucky Geological Survey [24, 25]