If you have reason to believe that you have a radon problem in your rental unit, you’ll want to have your place tested, either with a do-it-yourself radon test kit or by hiring a professional radon contractor. It’s reasonable to ask your landlord to pay for the radon testing. You can use this sample letter as a model in preparing your own.
If your letter doesn’t get results, you might consider buying an inexpensive radon test kit yourself and then using the results to motivate your landlord to take further action. You can use the Sample Letter to Landlord Regarding a Likely Radon Problem on the Nolo site as a template in preparing your own letter.