CAUTION: USE THESE MAPS WITH CARE.
MAPS can only answer questions about the general properties of the data's spatial values and variation. For example, the Minnesota radon indoor map cannot tell you what the radon is in your house; it can only give a range of likely results that you might get if you made a radon measurement in the lowest lived-in level of your home. Other maps are designed to provide an estimate of the average radon (useful in judging health risk in areas), the percent of homes in excess of the current USEPA action level, radon in the outside air, and the potential for saving lives through radon mitigation. Care has been taken to base these maps on the best available independently-gathered randomized and unbiased measurements of radon or authoritative sources in the case of the national
These maps are based on 2589 long-term radon measurements
in home living spaces in 469 zip code areas from across
ZIP CODE Median Radon Map
COUNTY ESTIMATED Geometric Mean
NEW MN CONTOUR MAPS
OLDER MAP; THIS MAP IS NOT BASED ON RANDOM OR QA VERIFIED DATA
This map shows the contours that result from an analysis of approximately 32,000 Landauer-brand alpha track detectors (ATDs) obtained from the Minnesota Health Department, the American Lung Association of Minnesota, and Landauer Tech Ops Inc. Most of these measurements were made by individual homeowners for an interval of 30 days or more during the years 1987 to 1992. These data were scanned to eliminate obvious cases where the measurements were short-term, soil or water measurements, duplicates, or laboratory blanks or spikes. The data were then aggregated by zipcode and only zipcodes with two or more results were retained. A contour map was developed from these data using a Kriging algorithm with grid points separated by approximately 10 km. These contours are called the ZIPCON values. To test the utility of the Zipcon values to predict annual average radon concentrations in living spaces, we compared them to our independent measurements during the past 10 years of more than 400 homes in 51 small and medium sized towns throughout Minnesota. In each home, the lowest two levels were measured with ATDs (Steck 1989) for one year. The average of the two ATDs is used to estimate the average concentration in the house. The ZIPCON values are good predictors for town average values.
Questions/Comments, e-mail: Dr. Steck
Last revised : 16 June, 2010
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