According to error analysis of sound level measurement and practical case some objection was raised to levy standard on Noise Exceeding Environment standard.
2
烟尘控制区逐年扩大,市区区域环境噪声等效声级56.6分贝,达到国家规定的控制目标。
Smoke and dust control area is extending year by year, and noise in urban area is controlled below 56.6 DB, meeting the national standard.