This excellent report from the Portland Oregonian / Oregon Live exposes the effects and dimensions of HUD's failure to require radon testing and mitigation in public housing properties across the US.
HUD does deserve credit for testing and mitigation requirements in other segments of its multifamily housing portfolio.The agency needs to expand the attention to the public and assisted housing stock through more specific Housing Quality Standards that include radon testing and mitigation by qualified personnel and with new resources to pay for testing and mitigation in public housing.
https://projects.oregonlive.com/radon/