AIR POLLUTION CONTROL (CONSOLIDATION) STATEMENT OF AIR QUALITY OBJECTIVES

AIR POLLUTION CONTROL (CONSOLIDATION) STATEMENT OF AIR QUALITY OBJECTIVES

AIR CONTROL ZONES (CONSOLIDATION) STATEMENT OF
AIR QUALITY OBJECTIVES
(Cap. 311, section 7)
[2 January 1987]

L.N. 1 of 1987, L.N. 389 of 1989

1. The air quality objectives set out in the Schedule have been established for
the following air control zones-
(a) Harbour Air Control Zone;
(b) Tsuen Wan-Kwai Chung Air Control Zone;
(c) Junk Bay Air Control Zone;

(d) Lantau Air Control Zone;
(e) Fanling-Sha Tau Kok Air Control Zone;
(f) Port Shelter Air Control Zone;
(g) South Hong Kong Island-Lamma Air Control Zone;
(h) Tolo Air Control Zone;
(i) Tuen Mun Air Control Zone; and
(j) Yuen Long Air Control Zone.

2. For the purposes of comparing air quality with the air quality objectives
set out in the Schedule, all measurements of air quality must be adjusted to a
reference temperature of 298K and to a reference pressure of 10 1. 325 kPa.

SCHEDULE

(A) SULPHUR DIOXIDE
(i) The concentration of sulphur dioxide in air averaged over any one hour shall not exceed
800 micrograms per cubic metre on more than 3 occasions per year.
(ii) The concentration of sulphur dioxide in air averaged over any 24 hour period shall not
exceed 350 micrograms per cubic metre more than once per year.
(iii) The concentration of sulphur dioxide in air averaged over a year shall not exceed 80
micrograms per cubic metre.
(B) TOTAL SUSPENDED PARTICULATES
(i) The concentration of total suspended particulates in air averaged over any 24 hour period
shall not exceed 260 micrograms per cubic metre more than once per year.
(ii) The concentration of total suspended particulates in air averaged over a year shall not
exceed 80 micrograms per cubic metre.
(C) RESPIRABLE SUSPENDED PARTICULATES
(i) The concentration of respirable suspended particulates in air having a nominal
aerodynamic diameter of 10 micrometres or less, averaged over any 24 hour period, shall
not exceed 180 micrograms per cubic metre more than once per year.





(ii) The concentration of respirable suspended particuIates in air having a nominal
aerodynamic diameter of 10 micrometres or less, averaged over a year, shall not exceed 55
imcrograms per cubic metre.
(D) NITROGEN DIOXIDE
(i) The concentration of nitrogen dioxide in air averaged over any one hour shall not exceed
300 micrograms per cubic metre on more than 3 occasions per year.
(ii) The concentration of nitrogen dioxide in air averaged over any 24 hour period shall not
exceed 150 micrograms per cubic metre more than once per year.
(iii) The concentration of nitrogen dioxide in air averaged over a year shall not exceed 80
micrograms per cubic metre.
(E) CARBON MONOXIDE
(i) The concentration of carbon monoxide in air averaged over any one hour shall not exceed
30 000 micrograms per cubic metre on more than 3 occasions per year.
(ii) The concentration of carbon monoxide in air averaged over any 8 hour period shall not
exceed 10 000 micrograms per cubic metre more than once per year.
(F) PHOTOCHEMICAL OXIDANTS DETERMINED BY
MEASUREMENT OF OZONE
(i) The concentration of photochemical oxidants in air averaged over any one hour shall not
exceed 240 micrograms per cubic metre on more than 3 occasions per year.
(G) LEAD
(i) The concentration of lead in air averaged over any 3 month period shall not exceed 1.5
micrograms per cubic metre.

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