For example, ifthe noise were steady (as defined in the regulation), there would be no need to
measure fora full hour.
Page 1
Illinois Pollution Control Board — Noise Rulemaking February 7,20032.
The American National Standard ANSI S12.9-l993fPart 3, “Short-Term Measurements with an
Observer Present” should be added as a referencestandard under Section 900.101.
4.
In the definition ofLeq, add “...the measure is a time-averaged sound level during a stated time-
interval, T.”This addition is necessary to be consistent with currentANSI terminology per ANSI S 1.1.5. The definition “Period ofobservation” should b...
Allowed
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