23-4  Air Quality by Area Type and Roadside Condition (2007)
	(microgram/cu.m.)
	Annual average air pollutant concentrations
Area Type and			Total	Respirable
Roadside	Sulphur	Nitrogen	Suspended	Suspended
	Dioxide	Dioxide	Particulates	Particulates
Urban①	22.5	61.0	80.4	55.2
New Town②	20.5	49.8	78.3	55.8
Rural③	17.0	15.0	-	53.0
Roadside④	22.3	97.0	115.0	73.0
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.