Maximum permissible ambient noise sound pressure levels in one-third octave bands for the audiometric conditions ears covered and ears not covered and test frequency ranges from 125 to 8000 Hz, 250 to 8000 Hz, and 500 to 8000 Hz. Tabled values are in dB.

	EARS COVERED
One-third Octave Band Intervals	125 to 8000 Hz	250 to 8000 Hz	500 to 8000 Hz
125	29.0	31.5	42.5
250	17.5	17.5	28.5
500	14.5	14.5	14.5
800	16.5	16.5	16.5
1000	21.5	21.5	21.5
1600	21.5	21.5	21.5
2000	23.0	23.0	23.0
3150	28.5	28.5	28.5
4000	29.5	29.5	29.5
6300	33.0	33.0	33.0
8000	38.5	38.5	38.5

	EARS NOT COVERED
One-third Octave Band Intervals	125 to 8000 Hz	250 to 8000 Hz	500 to 8000 Hz
125	23.0	27.5	37.5
250	13.5	13.5	23.5
500	9.5	9.5	9.5
800	7.5	7.5	7.5
1000	9.0	9.0	9.0
1600	5.5	5.5	5.5
2000	3.5	3.5	3.5
3150	3.5	3.5	3.5
4000	4.0	4.0	4.0
6300	9.0	9.0	9.0
8000	15.5	15.5	15.5

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