Appendix 910.APPENDIX A

Ill. Admin. Code tit. 35, § 910.APPENDIX A

Tables of Long-Term Background Ambient Noise

AUTHORITY: Implementing and authorized by Sections 25 and 27 of the Environmental Protection Act [415 ILCS 5/25 and 27].ILLINOIS POLLUTION CONTROL BOARD

Section 910.TABLE D Nighttime long-term background ambient L_eq levels in decibels by land use categories and octave-band level

	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