The following shows the air pollution levels across Hong Kong, subdivided according to the types of pollutants and duration laid down here. Please click here for the calculations involved. Note that the values in the "index" column may not equal the true index shown in official pages due to rounding errors. Graphs for the concentrations of pollutants are shown on the right.
Data as of 2010-09-08 17:00 HKT
Sub indices
Index
Station
RSP (24-hr)
SO2 (24-hr)
SO2 (1-hr)
NO2 (24-hr)
NO2 (1-hr)
CO (8-hr)
CO (1-hr)
O3 (1-hr)
General Station
93
Central/Western
32
9
6
26
37
N/A
N/A
93
64
Eastern
27
12
5
36
39
N/A
N/A
64
74
Kwai Chung
34
20
6
43
49
N/A
N/A
74
73
Kwun Tong
43
12
5
46
73
N/A
N/A
35
59
Sha Tin
40
9
4
30
46
N/A
N/A
59
61
Sham Shui Po
29
20
7
39
61
N/A
N/A
51
92
Tai Po
38
7
4
29
25
N/A
N/A
92
82
Tap Mun
31
8
1
14
6
5
2
82
57
Tsuen Wan
36
17
8
41
54
5
2
57
99
Tung Chung
30
9
4
20
17
10
4
99
105
Yuen Long
43
16
7
37
40
11
4
105
Roadside Station
98
Causeway Bay
54
7
3
87
98
18
7
N/A
108
Central
48
9
6
63
108
13
5
N/A
103
Mong Kok
43
11
7
75
103
10
5
N/A
Pollutant concentration (microgram / cubic metre)
Station
RSP (24-hr)
SO2 (24-hr)
SO2 (1-hr)
NO2 (24-hr)
NO2 (1-hr)
CO (8-hr)
CO (1-hr)
O3 (1-hr)
General Station
Central/Western
35
15
45
42
112
N/A
N/A
223
Eastern
30
19
43
57
118
N/A
N/A
154
Kwai Chung
38
33
49
68
147
N/A
N/A
178
Kwun Tong
47
20
37
73
220
N/A
N/A
83
Sha Tin
45
15
33
49
139
N/A
N/A
143
Sham Shui Po
33
32
59
63
184
N/A
N/A
124
Tai Po
42
12
32
46
76
N/A
N/A
221
Tap Mun
35
13
11
23
18
518
564
196
Tsuen Wan
40
27
68
66
161
483
679
136
Tung Chung
34
15
32
31
51
1016
1116
238
Yuen Long
47
26
58
59
120
1137
1346
247
Roadside Station
Causeway Bay
65
12
26
132
293
1783
2185
N/A
Central
52
14
44
99
368
1265
1495
N/A
Mong Kok
47
18
57
116
327
1049
1380
N/A
Notes:
Pollution levels are represented by the following colours:
Green : Low (Index between 0 and 25)
Blue : Medium (Index between 26 and 50)
Yellow : High (Index between 51 and 100)
Red : Very High (Index between 101 and 200)
Black : Severe (Index between 201 and 500)
The graphs on the right are shaded according to the colour scheme in (1) above, subject to the duration selected which is explained in (3) below.
The "Duration" option switches the time period depending on which the pollution levels for various pollutants are determined. According to this page, a number of pollutants have two sub-indices, and for the sub-index representing the shorter duration (e.g. the concentration in the past hour is "short", while the average concentration over 24 hours is "long") to achieve the same pollution level, a higher concentration is usually necessary. For pollutants that have only one classification according to duration, the charts generated are the same no matter which "Duration" option is chosen. The duration for each pollutant under each option is tabulated below:
The circle near the right hand side of each plot represents the average pollutant concentration over the "long" duration specified in the above table. As such, they will only be visible in the "long" duration plots.
Last Accessed: Wed Sep 08 2010 18:31:57 HKT
Last Modified: Sun Apr 04 2010
Air Pollution Levels
