From the same article: > McBride and his co-authors estimated that individuals living near coal-fired installations are exposed to a maximum of 1.9 millirems o

From the same article: > McBride and his co-authors estimated that individuals living near coal-fired installations are exposed to a maximum of 1.9 millirems of fly ash radiation yearly. To put these numbers in perspective, the average person encounters 360 millirems of annual "background radiation" from natural and man-made sources, including substances in Earth's crust, cosmic rays, residue from nuclear tests and smoke detectors.