Maximum Permissible Ambient Noise Levels (MPANL) if Testing to 0 dB HL (ANSI S3.1)

Image used with permission from Scollie, S, Western University, London Ontario

	Maximum Permissible Ambient Noise Levels (MPANL) if Testing to 0 dB HL (ANSI S3.1)						MPANL if Testing to 25 dB eHL
	Ears not covered			Insert earphones			Ears not covered	Insert earphones
	125 to 8000	250 to 8000	500 to 8000	125 to 8000	250 to 8000	500 to 8000	500 to 8000	500 to 8000
125	24	30	39	59	67	78	64	103
250	16	16	25	53	53	64	50	89
500	11	11	11	50	50	50	36	75
1000	8	8	8	47	47	47	33	72
2000	9	9	9	49	49	49	34	74
4000	6	6	6	50	50	50	31	75
8000	9	9	9	56	56	56	34	81