1. Industrialisation: Most of the industries use big machines which are capable of producing a large amount of noise.
2. Construction Activities: Under construction activities like mining, construction of bridges, dams, buildings, stations, roads, flyovers which take place in almost every part of the world.
3. Fireworks: The firework at the display on various occasions in our country is also a source of the noise.
4. Social Events: Noise is at its highest peak in most of the social events, like marriages, parties, disco, pubs, worship places, etc.