.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.
Radon in indoor air results in a dose equivalent of about 200 millirem annually, on the average, but can be much higher or lower depending on the radon level in a person's home. Besides radon, the average dose equivalent from background radiation to residents of the United States is about 100 millirem per year.adon in indoor air results in a dose equivalent of about 200 millirem annually, on the average, but can be much higher or lower depending on the radon level in a person's home. Besides radon, the average dose equivalent from background radiation to residents of the United States is about 100 millirem per year.