.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.
A short term test is performed (with a duration of 2 to 90 days) to quickly identify homes/buildings in which high radon levels may exist. Short term measurements showing less than 4 pCi/l (0.02 WL) indicate that the annual average is probably less than the guideline.our (4) pCi/l of radon is equivalent to 0.02 WL. A continuous exposure to 0.02 WL is equivalent to a yearly cumulative exposure of approximately one (1) Working Level Month (WLM) , which is derived by multiplying 0.02 WL by 24 hours/day by 365 days/year and dividing this value by 170 hours in a working month.