What radon zone is Iowa in?
zone 1
The Iowa Radon Survey has indicated that Iowa has the largest percentage (or 71.6%) of homes above the US Environmental Protection Agency action level of 4pCi/L. It is also designated by the US EPA as an entirely zone 1 state, which means that at least 50% of the homes are above US EPA’s recommended action level.
What is Zone 2 for radon gas potential?
Zone 2 is colored orange for moderate potential, with average radon levels between 2 and 4 picocuries per liter. Zone 3, with the lowest risk of exposure, is yellow and has less than 2 picocuries per liter.
What does radon Zone 1 mean?
What do the colors mean? Zone 1 (red zones) Highest potential; average indoor radon levels may be. greater than 4 pCi/L (picocuries per liter)
What is the EPA acceptable level for radon?
4 pCi/L
EPA recommends homes be fixed if the radon level is 4 pCi/L (picocurries per liter) or more. Because there is no known safe level of exposure to radon, EPA also recommends that Americans consider fixing their home for radon levels between 2 pCi/L and 4 pCi/L.
What are normal levels of radon?
According to the EPA, the maximum “acceptable” level of radon is 4.0 pCi/L, but even that level is not “safe”, per se. The EPA strongly recommends you consider radon mitigation between levels 2.0 and 4.0. For perspective, the average outdoor air level of radon is 0.4 pCi/L.
What do EPA radon zones mean?
The Map of Radon Zones was developed in 1993 to identify areas of the U.S. with the potential for elevated indoor radon levels. The map is intended to help governments and other organizations target risk reduction activities and resources. Fix your home if your radon level is 4 picocuries per liter (pCi/L) or higher.
Is radon higher in basement?
Also, once the windows, doors, or vents are closed, the radon concentration returns to the previous level within hours according to EPA studies. FACT: Its concentration is usually the highest in basements, simply because it emanates out of the soil through the basement.
What time of year is radon highest?
winter
The reason that radon levels in the home can be higher in the summer and winter is two-fold. During the winter, the air in your home tends to be much warmer than the outside air, and this temperature difference creates a vacuum within your home.