.pld Extension - List of programs that can open .pld files In the following table, you can find a list of programs that can open files with .pld extension.This list is created by collecting extension information reported by users through the 'send report' option of FileTypesMan utility.
According to a national residential radon survey completed in 1991, the average indoor radon level in the United States is 1.3 picocuries per liter (pCi/L). The average outdoor level is about 0.4 pCi/L. Excessive radon levels have been found in all of the 50 states.
Overall, one in four houses in the Portland area, well above the national average, accumulates radon above EPA's action level of 4 picocuries per liter of air. Health officials say everyone should test homes and fix the problem if levels are too high. Overall, one in four houses in the Portland area, well above the national average, accumulates radon above EPA's action level of 4 picocuries per liter of air. So here's a belated primer. Thanks to Scott Burns of Portland State University, Steve Tucker of Cascade Radon and Don Francis of EcoTech for their help. testing When: Now is a great time because radon levels tend to be higher in winter.