3. • It is an unpleasant noise created by people or machines that
can be annoying, distracting, intrusive or physically painful
Sources
• Road traffic
• Jet planes
• Garbage
• Trucks
4. • Construction equipment
• Manufacturing processes
• Leaf blowers
Sound is measured in decibels(dB).
Impacts of noise
• Annoyance to the receptors
• Physiological effects- breathing amplitude, blood pressure,
heart beat rate, pulse rate