当前世界环境

Modern life has given rise to new form of pollution, called noise pollution. No doubt noise is a normal phenomenon of life and is deemed to be one of the most effective alarm systems in man’s physical environment. It is potentially a serious signal and grave to the environmental health. The modern civilization creates more and more noise, because of the development of industry, machinery and technology. It has been reported that noise inside the factories can become a health hazard causing deafness. The sound intensity is measured in decibel (dBA). Which is 10th part of the longest unit Bel, one dBA is equal to the faintest sound, a human ear can hear. Decibel (dBA) is ratio expressed as the logarithmic scale relative to a reference sound pressure level. The major problem around the town where facing is the quarry blasting a lot of noise affecting on the style of man kind.