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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 C. Daytime long-term background ambient Leq levels in decibels by land use
Latest version.
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Background Category
Octave-Band Center Frequency (Hz)
1
2
3
4
5
31
70
63
55
49
43
63
71
64
57
51
45
125
72
64
57
51
45
250
70
63
55
49
43
500
67
59
51
45
39
1000
63
54
45
39
33
2000
57
48
38
33
26
4000
53
42
30
25
20
8000
48
36
24
19
13