24-4  Air Quality by Area Type and Roadside Condition (2011)
	(microgram/cu.m.)
Area Type and	Annual average air pollutant concentrations
			Total	Respirable
Roadside	Sulphur	Nitrogen	Suspended	Suspended
	Dioxide	Dioxide	Particulates	Particulates
Urban①	15	63	74	49
New Town②	12	49	72	49
Rural③	10	12	–-	47
Roadside④	12	122	102	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.