TNAG-1980-FCO40-2813-Pollution-in-Hong-Kong-1989 — Page 59

Hong Kong Air Quality Objectives

Concentration in micrograms per cu bic metre (i)

Pollutant

1 Hour (ii)

8 Hours (iii)

Averaging Time

24 Hours

(iii)

}

Health effects of pollutant at elevated ambient levels

3 Months (iv)

1 Year (iv)

Sulphur Dioxide

800

Total Suspended

CONFIDS

Partial lates

Respirable (v)

Suspended

Particu lates

Nitrogen Dioxide

300

Carbon Monoxide

30,000

10,000

Photoche mi cal Oxidants (as

240

ozone) (vi)

Lead

350

80

Respiratory illness; reduced lung function; morbidity and mortality rates increase at higher levels.

260

80

Respirable fraction has effects on health.

180

55

150

80

Respiratory illness; reduced lung function; cancer risk for certain particles; morbidity and mortality rates increase at higher levels.

Respiratory irritation; increased susceptibility to respiratory infection; lung development impairment.

CONFIDENTIAL

Impairment of co-ordination; deleterious to pregnant women and those with heart and circulatory conditions.

Eye irritation; cough; reduced athletic performance; possible chromosome damage.

1.5

Measured at 298° K (25°C) and 101.325 kPa (one atmosphere).

Affects cell and body processes; likely neuropsychological effects, particularly in children; likely effects on rates of incidence of heart attacks, strokes and hypertension.

Not to be exceeded more than once per year. Arithmetic means.

(i)

(ii)

Not to be exceeded more than three ti mes per year.

(iii)

(iv)

(v)

(vi)

Respirable suspended particulates means suspended particles in air with a nominal aerodynamic diameter of 10 micrometres and smaller.

Photoche mi cal oxidants are determined by measurement of oz one only.

47 -

Table 1

(para. 4.5)