The so-called "Watras incident" in 1984 is named for American construction engineer Stanley Watras, an employee at a U.S. nuclear power plant, who triggered radiation monitors while leaving work over several days—even though the plant had not yet been fueled, and despite Watras being decontaminated and sent home "clean" each evening. This pointed to a source of contamination outside the power plant, which turned out to be radon levels of 100,000 Bq/m3 (2.7 nCi/L) in the basement of his home. He was told that living in the home was the equivalent of smoking 135 packs of cigarettes a day, and he and his family had increased their risk of developing lung cancer by 13 or 14 percent.[21] The incident dramatized the fact that radon levels in particular dwellings can occasionally be orders of magnitude higher than typical.[22] Radon soon became a standard homeowner concern,[23] though typical domestic exposures are two to three orders of magnitude lower (100 Bq/m3, or 2.5 pCi/L),[24] making individual testing essential to assessment of radon risk in any particular dwelling.