23-4 Air Quality by Area Type and Roadside Condition (2009)
	(microgram/cu.m.)
	Annual average air pollutant concentrations
Area Type and	Sulphur	Nitrogen	Total	Respirable
Roadside	Dioxide	Dioxide	Suspended	Suspended
			Particulates	Particulates
Urban①	16	59	71	47
New Town②	12	46	64	47
Rural③	11	11	-	44
Roadside④	14	110	98	61
Notes : ①Includes Kwai Chung, Central/Western, Sham Shui Po, Kwun Tong, Eastern and Tsuen Wan.
②Includes Tai Po, Sha Tin, Yuen Long and Tung Chung.
③Includes Tap Mun.
④Includes Causeway Bay, Central and Mong Kok.