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<br />TABLE OF CONTENTS <br /> <br />- <br /> <br />INTRODUCTION 3 <br />Wave }r1otion 3 <br />Decibel Levels afCommon Noise Sources 5 <br />USING DECIBELS 6 <br />Distance Attenuation Estimations 6 <br />Addition and Subtraction of Decibel Levels 7 <br />Background Nol.'le Correction 8 <br />HUMAN PERCEPTION OF SOUND 9 <br />Perceived Change in Decibel Levels 9 <br />Weighting Networks 9 - <br />MEASUREMENT PROCEDURES 11 <br />Errors Caused by Reflecting Objects 11 <br />NTP~l il1easurement Procel/ures 12 <br />NTP-2 Test Procedure \3 <br />RULES OF THUMB 17 <br />REGULATORYAGENC~S 18 <br />NOISE RULES AND STA TUTES 19 <br />l\1innesota Noise Pollution Control Rules 19 <br />Minnesota iWotar Vehicle Noise Limits 26 <br />Minnesota Motorboat Noise Limits 29 <br />Minnesota Snowmobile Noise Limits 30 <br /> - <br /> <br />2 <br />