Noise pollution from outside sources such as transportation, industrial, construction activities are generally present in all areas of our lives. Excessive noise exposure can interfere with speech, cause annoyance, sleep disturbance, hearing damage and stress related cardiovascular health problems.
Common sources of environmental noise are

• Road/Rail/aviation traffic
• Industrial & chemical plant
• HVAC equipments eg compressors, cooling towers etc
• Construction machineries eg, jackhammer, piling, drilling, genset etc