Other equipments compressors, generators, exhaust fans, grinding mills used in the factories and industries also produces big noise.
The school was located next to a railroad and on side of the building was exposed to continuous noise pollution. The urbanization and modern civilization, and the impact of higher degree of industrialization are the sources of noise pollution.
Murray Schafer's soundscape research was groundbreaking in this regard.
Annoyance: When we think, talk, listen to music, or sleep we need quiet. We must improve lubrications. All sound is not noise. Increasing the demand of urbanization and industrialization in India is causing major exposure of people to the unwanted sounds.