Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 910 - MEASUREMENT PROCEDURES FOR THE ENFORCEMENT OF 35 ILL. ADM. CODE 900 AND 901
Appendix A - Tables of Long-Term Background Ambient Noise
Table B - Nighttime long-term background ambient L[eq] levels in decibels by land use categories and 1/3 octave-band level

Universal Citation: 35 IL Admin Code § B

Current through Register Vol. 48, No. 38, September 20, 2024

	Background Category
Octave-Band Center Frequency (Hz)	1	2	3	4	5
20	53	48	43	37	31
25	54	49	44	38	32
31	55	50	45	39	33
40	55	50	46	39	33
50	56	51	46	40	34
63	56	51	47	41	35
80	57	52	47	41	35
100	58	52	48	42	36
125	57	51	47	41	35
160	56	51	47	41	35
200	56	50	46	40	34
250	55	50	45	39	33
315	54	49	44	38	32
400	53	47	43	37	31
500	52	46	41	35	29
630	51	45	39	33	27
800	50	43	37	31	25
1000	48	41	35	29	23
1250	46	39	33	27	21
1600	44	37	31	25	19
2000	42	35	28	23	16
2500	40	33	25	20	14
3150	39	31	23	18	12
4000	38	29	20	15	10
5000	36	27	18	13	8
6300	34	25	16	11	5
8000	33	23	14	9	3
10,000	31	21	12	7	1
12,500	29	19	10	2

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