According to the "People's Republic of China *** and the State Urban Area Noise Standards", clearly stipulates the maximum limit of environmental noise in five types of urban areas: residential, cultural and educational institutions are mainly in the area, daytime is 50 decibels, nighttime is 40 decibels. In commercial centers, hypermarkets, hardware and building materials stores and other places, 60 decibels during the day and 50 decibels at night. Square dance 80 decibels has exceeded the prescribed decibel limit, counted as a nuisance.