TITLE 35: ENVIRONMENTAL PROTECTION SUBTITLE H: NOISE
CHAPTER I: ILLINOIS POLLUTION CONTROL BOARD
PART 910 MEASUREMENT PROCEDURES FOR THE ENFORCEMENT OF 35 ILL. ADM. CODE 900 & 901
SECTION 910.APPENDIX A TABLES OF LONG-TERM BACKGROUND AMBIENT NOISE

Section 910.APPENDIX A   Tables of Long-Term Background Ambient Noise

 

Section 910.TABLE D   Nighttime long-term background ambient Leq 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