Table 5.1 Hong Kong Air Quality Objectives

Pollutant	Maximum Average Concentration (µg m^-3) ^(1)
	1-Hour ^(2)	8-Hour ^(3)	24-Hour ^(3)	Annual ^(4)
Total Suspended Particulates	-	-	260	80
Respirable Suspended Particulates ^(5)	-	-	180	55
Sulphur Dioxide	800	-	350	80
Nitrogen Dioxide	300	-	150	80
Carbon Monoxide	30,000	10,000	-	-

(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.