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1. Go to bit.ly/efectoscontaminacion. Read the explanation about noise pollution and watch the related video.

a) List the different types of noise pollution mentioned in the video.

1. Traffic

2. Industrial activity

3. Location

4. Nightlife

5. Airports

6. Ports

7. Train stations

b) What decibel level does the World Health Organization define as noise pollution? Is it the same for all cities and all public places?

65 decibels

No 

c) Describe four negative effects of noise pollution that have an impact on people’s health.

 2. In your Bloog, complete these sentences with words related to sound qualities:

a) The property or parameter relating to time is   .

 1. 

b) A loud or soft sound tells us about its   .

c) That voice sounds familiar; I recognise its   .

d) His voice was so    that I could hardly hear it.

e) That siren was emitting a sound that was very   .