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Illinois Administrative Code (Last Updated: March 27, 2024) |
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TITLE35. ENVIRONMENTAL PROTECTION |
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PART910. MEASUREMENT PROCEDURES FOR THE ENFORCEMENT OF 35 ILL. ADM. CODE 900 & 901 |
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Section910.APPENDIX A. Tables of Long-Term Background Ambient Noise |
§910.TABLE D. Nighttime long-term background ambient Leq levels in decibels by land use categories and octave-band level
Latest version.
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Background Category
Octave-Band Center Frequency (Hz)
1
2
3
4
5
31
60
55
50
44
38
63
61
56
52
46
40
125
62
56
52
46
40
250
60
55
50
44
38
500
57
51
46
40
34
1000
53
46
40
34
28
2000
47
40
33
28
21
4000
43
34
25
20
15
8000
38
28
19
14
8