Table 8.1 Hong Kong Air Quality Objectives

Pollutant	Maximum Concentration (µg m^-3) ^(1)
	Averaging Time
	1 hour ^(2)	8 hour ^(3)	24 hour ^(3)	Annual ^(4)
Total Suspended Particulates (TSP)	^-	-	260	80
Respirable Suspended Particulates (RSP) ^(5)	-	-	180	55
Sulphur Dioxide (SO2)	800	-	350	80
Nitrogen Dioxide (NO2)	300	-	150	80
Carbon Monoxide (CO)	30,000	10,000	-	-
Photochemical Oxidants (as Ozone, O3) ^(6)	240	-	-	-

Note:

(1) Measured at 298 K and 101.325 kPa.

(2) Not to be exceeded more than three times per year.

(3) Not to be exceeded more than once per year.

(4) Arithmetic mean.

(5) Suspended particulates in air with a nominal aerodynamic diameter of 10 mm or smaller.

(6) Photochemical oxidants are determined by measurement of ozone only.