Air Conditioning Noise Levels (relative loudness of typical noise sources in indoor and outdoor environments)

Sound levels (dB) and relative loudness of typical noise sources in indoor and outdoor environments

dB(A)	Overall Level	Community Noise Levels (Outdoors)	Home and Industry Noise Levels	Subjective Loudness (Relative to 70 dB)
120	Uncomfortably Loud	Military jet aircraft take-off from aircraft carrier with afterburner at 50 ft . . . 130 dB	Oxygen Torch . . . 121 dB	32 times as loud
110		Turbo-fan aircraft at takeoff power at 200 ft . . . 118 dB	Riveting machine . . . 110 dB Rock band . . . 108 - 114 dB	16 times as loud
100	Very loud	Boeing 707 or DC-8 aircraft at one nautical mile (6080 ft) before landing . . . 106 dB Jet flyover at 1000 feet . . . 103 dB Bell J-2A helicopter at 100 ft . . . 100 dB		8 times as loud
90		Boeing 737 or DC-9 aircraft at one nautical mile (6080 ft) before landing . . . 97 dB Power mower . . . 96 dB Motorcycle at 25 ft . . . 90 dB	Newspaper press . . . 97 dB	4 times as loud
80		Car wash at 20 ft . . . 89 dB Propeller plane flyover at 1000 ft . . . 88 dB Diesel truck 40 mph at 50 ft . . . 84 dB Diesel train 45 mph at 100 ft . . . 83 dB	Food blender . . . 88 dB Milling machine . . . 85 dB Garbage disposal . . . 80 dB	2 times as loud
70	Moderately loud	High urban ambient sound . . . 80 dB Passenger car 65 mph at 25 ft . . . 77 dB Freeway at 50 ft from pavement edge 10 a.m. . . . 76 dB	Living room music . . . 76 dB Radio or TV-audio. vacuum cleaner . . . 70 dB	70 dB(A)
60		Air conditioning unit at 100 ft . . . 60 dB	Cash register at 10 ft . . . 65-70 dB Electric typewriter at 10 ft . . . 64 dB Dishwasher (Rinse) at 10 ft . . . 60 dB Conversation . . . 60 dB	1/2 as loud
50	Quiet	Large transformers at 100 ft . . . 50 dB		1/4 as loud
40		Bird calls . . . 44 dB Lowest limit of urban ambient sound . . . 40 dB
10		Just audible
0		Threshold of Hearing