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 2012-02-06 00:00 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
37
Central/Western
37
5
1
36
21
N/A
N/A
5
40
Eastern
31
4
0
40
22
N/A
N/A
12
38
Kwai Chung
29
4
1
38
20
N/A
N/A
8
37
Kwun Tong
30
6
1
37
22
N/A
N/A
9
31
Sha Tin
31
5
N/A
26
N/A
N/A
N/A
N/A
54
Sham Shui Po
33
4
1
54
30
N/A
N/A
1
36
Tai Po
36
3
0
29
19
N/A
N/A
13
34
Tap Mun
34
8
1
9
6
4
1
23
41
Tsuen Wan
26
6
1
41
22
10
3
7
29
Tung Chung
27
6
1
29
9
9
3
21
34
Yuen Long
27
6
1
34
18
8
2
9
Roadside Station
80
Causeway Bay
44
5
1
80
29
10
3
N/A
63
Central
39
5
1
63
31
6
2
N/A
78
Mong Kok
35
5
1
78
41
15
4
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
41
7
6
58
62
N/A
N/A
13
Eastern
34
6
2
64
65
N/A
N/A
28
Kwai Chung
32
7
5
61
60
N/A
N/A
19
Kwun Tong
33
10
7
59
66
N/A
N/A
23
Sha Tin
35
8
N/A
41
N/A
N/A
N/A
N/A
Sham Shui Po
36
6
5
86
91
N/A
N/A
3
Tai Po
40
5
3
47
58
N/A
N/A
31
Tap Mun
37
13
10
14
17
447
414
56
Tsuen Wan
29
9
7
66
66
1026
1001
17
Tung Chung
30
10
8
46
28
852
771
50
Yuen Long
31
9
7
55
53
809
656
22
Roadside Station
Causeway Bay
48
8
5
122
86
1039
943
N/A
Central
43
8
7
98
92
648
575
N/A
Mong Kok
39
7
6
119
123
1472
1277
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: Mon Feb 06 2012 01:50:55 HKT
Last Modified: Fri Dec 03 2010
Air Pollution Levels
