Ill. Admin. Code tit. 35, § 901.103 – Sound Emitted to Class B Land

Except as provided elsewhere in this Part, a person must not cause or allow the emission of sound from any property-line noise source located on any Class A, B or C land to any receiving Class B land that exceeds any allowable octave band sound pressure level specified in the following table, when measured at any point within the receiving Class B land. Sound pressure levels must be measured at least 25 feet from the property-line noise source.

Octave Band Center Frequency (Hertz)	Allowable Octave Band Sound Pressure Levels (dB) of Sound Emitted to any Receiving Class B Land from
	Class C Land	Class B Land	Class A Land

31.5	80	79	72
63	79	78	71
125	74	72	65
250	69	64	57
500	63	58	51
1000	57	52	45
2000	52	46	39
4000	48	41	34
8000	45	39	32

(Source: Amended at 42 Ill. Reg. 20453, effective November 1, 2018)