Superseded80% confidenceSolutionTime unknown
极高噪音环境(＞100dB持续，如射击/重工业)单一耳塞不足，需耳塞+耳罩双重防护，叠加后总防护约提升5dB而非简单相加
1
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80%
Confidence
Long-term
Relevance
-
First Seen
This knowledge claim has been superseded by newer content
射击/装修/演唱会等高强度噪音需NRR≥33dB的PU海绵塞或双重防护（耳塞+耳罩）；持续噪音超过85dB时单一耳塞不足以保护听力Sources
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