Environmental Studies(ES)

ENVIRONMENTAL STUDIES

Lesson 18: Noise pollution

Nose Control at receiver

When it is not practical or economical to reduce noise level, ear protectors are used. Ear protectors are capable of reducing the noise level at the ear by 10db. The most commonly used ear protected devices or HDP are ear plugs and ear muffs.

• Ear plug fit directly into the ear canal and is made up of rubber, plastic or wax-impregnated cotton.
  
• Ear muffs are plastic domes lined with foam that cover the ears and connected by a spring band. These offer the greatest amount of noise attenuation and easy to fit.