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In recent years we get more & more facts showing that the present appearance of our planet was formed not only by slow evolutionary processes, like wind erosion, but also by gigantic natural cataclysms. Geologists find evidence in sedimentary rock that extremely powerful impacts repeatedly occurred in the geological history of the Earth.

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Contents 1The Noise Problem 2Effects of Noise

Hearing Loss

Noise Interference

Sleep Disturbance

Noise Influence on Health

3Noise Sources

Jet Noise

Turbomachinery Noise

4Noise Measurement and Rules

Noise Effectiveness Forecast (NEF)

Effective Perceived Noise Level (EPNL)

5Noise Certification

Noise limits

6Calculations

Tupolev 154M Description

Noise calculations



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