upperexposureactionvalues是什么意思在国外关于噪声的标准中找到以下要求，不理解这里的upper和lower的意思，求高人解答。ForthepurposesofthisDirectivetheexposurelimitvaluesandexposureactionv

Question

upper exposure action values是什么意思
在国外关于噪声的标准中找到以下要求，不理解这里的upper和lower的意思，求高人解答。
For the purposes of this Directive the exposure limit values and exposure action values in respect of the daily noise
exposure levels and peak sound pressure are fixed at:
(a) exposure limit values: L EX,8h = 87 dB(A) and
p peak = 200 Pa ( 1 ) respectively;
(b) upper exposure action values: L EX,8h 85 dB(A) and
p peak = 140 Pa ( 2 ) respectively;
(c) lower exposure action values: L EX,8h = 80 dB(A) and
p peak = 112 Pa ( 3 ) respectively.

Answer 1

意思就是曝光值，在你这里意思就是噪音大小强度