The noise standard of residential buildings in Hangzhou is between 45 decibels and 55 decibels. According to the relevant information, emission standard for community noise stipulates that the noise standard in residential areas is between 45 decibels and 55 decibels, which is equivalent to a volume at which two people can hear each other clearly when talking in a room, and if it exceeds this volume, it can be regarded as noise disturbing the people. Hangzhou, called Lin 'an and Qiantang in ancient times, is a prefecture-level city, provincial capital, sub-provincial city and megacity under the jurisdiction of Zhejiang Province, a core city of Hangzhou metropolitan area, an economic, cultural and scientific center of Zhejiang Province approved by the State Council, and one of the central cities in the Yangtze River Delta.