12-17  Monitoring of Urban Environment Noise in Major Cities under National Control Programme (2006)
City	Grid Length	Grid Width	Total Number	Sound Level
	(m)	(m)	of Grids (unit)	dB(A)
Beijing	1000	1000	448	53.9
Tianjin	1000	1000	205	54.9
Shijiazhuang	500	500	240	53.8
Taiyuan	750	750	232	53.1
Hohhot	400	400	205	54.8
Shenyang	750	750	240	53.9
Changchun	500	500	204	56.3
Harbin	700	700	216	56.0
Shanghai	1414	1414	214	56.6
Nanjing	1000	1000	209	53.8
Hangzhou	500	500	340	55.9
Hefei	500	500	250	53.4
Fuzhou	500	500	220	56.2
Nanchang	500	500	201	55.8
Jinan	1000	1000	214	53.9
Zhengzhou	500	500	285	55.6
Wuhan	1000	1000	210	55.3
Changsha	500	500	288	54.3
Guangzhou	1000	1000	202	55.2
Nanning	550	550	241	54.3
Haikou	400	400	202	55.2
Chongqing	500	500	420	54.4
Chengdu	900	900	307	54.3
Guiyang	500	500	220	55.6
Kunming	800	800	223	54.9
Lhasa	500	500	196	53.8
Xi'an			200	55.8
Lanzhou	500	500	212	57.9
Xining	375	375	224	52.2
Yinchuan	500	500	200	53.1
Urumqi	750	750	209	55.1