Today’s map of the day shows the percent of homes built prior to 1950 by county for year 2000. From the data we can see many counties within the Midwestern and Northeastern states had a large percentage, 41.96 to 68.75, of homes built prior to 1950 indicated by the darker shading. In contrast counties within states such as Alaska, Hawaii, and various Western and Southeastern states had a low percentage of homes built prior to 1950 indicated by the yellow/yellowish shading. Although older homes can give the owner a sense of history there are some public health factors one might consider such as radon, lead poisoning, mold and asbestos. For instance according to the CDC homes built prior to 1978 are likely to have a lead-based pain and that chance increases the older the home is.