All buildings contain a certain amount of radon. The levels vary throughout the year, depending on weather conditions, how frequently doors and windows are opened, the ventilation in the home and other factors.
Most established hardware stores carry short-term and long-term radon test kits. To carry out a test, simply follow the test set-up instructions, and when the testing period is over, mail the sample to the address provided with the kit, and you will receive a report via email.
The short-term kits, which test radon levels over a period of a few days, are a useful way of determining whether a plan to reduce radon is working. However, since the radon levels vary over the course of the year, a long-term test is recommended in most cases. This will test your levels over a period of three to nine months.
You can also purchase a radon alarm, which will let you know immediately if your radon levels have risen above a certain threshold.