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{i' I <br /> ymY <br /> I 1 <br /> COMMON OUTDOOR NO/SE LEVEL COMMON INDOOR i S <br /> SOUND LEVELS da(A/ SOUND LEVELS <br /> -- 110 ROCK BAND <br /> CONCORDE LANDING AT 370ft <br /> 707 LANDING AT 370ft <br /> 707 TAKEOFF AT 1000 ft 100 <br /> GAS LAWN MOWER AT 3ff INSIDE SUBWAY TRAIN (New York) <br /> DIESEL TRUCK AT 50ft ____ 9© FOOD BLENDER AT 3ft <br /> NOISY URBAN DAYTIME — 80 GARBAGE DISPOSAL AT 3ff <br /> SHOUTING AT 3ft <br /> 747 TAKEOFF AT 1000ft -- 70 VACUUM CLEANER AT I0ft <br /> COMMERCIAL AREA NORMAL SPEECH AT 3ft <br /> — 60 <br /> LARGE BUSINESS OFFICE <br /> QUIET URBAN DAYTIME -- 50 DISHWASHER NEXT ROOM <br /> frb <br /> QUIET URBAN NIGHTTIME 40 SMALL THEATRE,LARGE CONFERENCE ROOM <br /> QUIET SUBURBAN NIGHTTIME <br /> (Bockground) <br /> LIBRARY <br /> - 30 i <br /> BEDROOM AT NIGHT <br /> QUIET RURAL NIGHTTIME CONCERT HALL (Background) <br /> - 20 <br /> BROADCAST &RECORDING STUDIO <br /> 10 <br /> THRESHOLD OF HEARING <br /> 0 <br /> FIG. 7. COMMON SOUND LEVELS. <br /> 17 <br /> n,wr._s. .r-. �....... <br />