Lempert B L, Edwards R G
Am Ind Hyg Assoc J. 1983 Dec;44(12):894-902. doi: 10.1080/15298668391405913.
NIOSH conducted field investigations in 1977 and 1981 to determine the actual noise reduction afforded to industrial workers who used insert-type hearing protectors (earplugs) daily. In-situ attenuation tests of 420 workers at 15 industrial plants were conducted to determine the noise reduction provided by earplugs as they were worn during the workday. The workplace results, when compared to manufacturers' best-fit laboratory test results, indicated that 50% of the workers tested were receiving less than one-half the potential attenuation of the earplugs.
美国国家职业安全与健康研究所（NIOSH）在1977年和1981年进行了实地调查，以确定日常使用插入式听力保护器（耳塞）的产业工人实际获得的降噪效果。对15家工厂的420名工人进行了现场衰减测试，以确定耳塞在工作日佩戴时的降噪效果。与制造商的最佳拟合实验室测试结果相比，工作场所的测试结果表明，50%的受测工人所获得的降噪效果不到耳塞潜在降噪效果的一半。
