23-4  Air Quality by Area Type and Roadside Condition (2008)
	(microgram/cu.m.)
	Annual average air pollutant concentrations
Area Type and	Sulphur	Nitrogen	Total	Respirable
Roadside	Dioxide	Dioxide	Suspended	Suspended
			Particulates	Particulates
Urban①	23	61	75	50
New Town②	18	50	74	53
Rural③	14	14	-	52
Roadside④	23	98	108	68
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.