Is there an acceptable amount of radon in your home?

In Canada, radon is measured in units called “becquerels per cubic meter” (Bq/m3 is a measurement of the number of radioactive disintegrations per minute).  Although there are no regulations regarding acceptable levels of radon in indoor air in Canada, Health Canada’s 2007 guideline recommends that remedial measures be taken in a dwelling whenever the average annual radon concentration in the normal occupancy area exceeds 200 becquerels per cubic meter.