24-4  Air Quality by Area Type and Roadside Condition (2006)
				(microgram/cu.m.)
	Annual average air pollutant concentrations
Area Type and			Total	Respirable
Roadside	Sulphur	Nitrogen	Suspended	Suspended
	Dioxide	Dioxide	Particulates	Particulates
Urban①	23	60	79	54
New Town②	23	51	76	55
Rural③	16	13	-	48
Roadside④	21	96	110	75
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.