Unit 3: Noise Pollution - Measuring Noise Pollution
- Created by: rosieevie
- Created on: 09-04-15 20:52
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- Measuring Noise Pollution
- Decibel Scale
- Bels measure sound volume based on human hearing
- Decibels avoid decimal values
- 1 Bell = 10 Decibels
- dB(A) Scale
- Modified decibel scale - weighs the frequencies to which the human ear is most sensitive
- Between 1000-4000Hz
- L10 18h
- Assumes traffic is only a problem during 18 hours (6am-12am)
- Noise level measured during nosiest 10% of each hour, then mean is calculated
- Traffic Noise Index
- Takes into account the noise levels that exceed for 10% (noisest) and 90% (quietest) of the time
- Noise and Number Index
- Number of flights and noise levels of aircrafts over 80dB
- Aircrafts below 80dB do not cause damage
- Decibel Scale
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