Air Quality
Good
Some pollutants may slightly affect very few hypersensitive individuals.
24
PM2.5
63
*
PM10
3
O3
1.0
CO
23
SO2
33
NO2
Some pollutants may slightly affect very few hypersensitive individuals.
Advise
Only very few hypersensitive people should reduce outdoor activities.
Air Quality
Today
19 Sep
76
Good
Fri
20 Sep
53
Good
Sat
21 Sep
53
Good
Sun
22 Sep
60
Good
Mon
23 Sep
65
Good
Tue
24 Sep
62
Good
Wed
25 Sep
62
Good
Air quality in the last 12 months (Cheung Chau)
|
2024/08
|
29
|
34
|
39
|
52
|
45
|
51
|
53
|
51
|
53
|
42
|
42
|
28
|
22
|
33
|
23
|
27
|
22
|
21
|
35
|
38
|
29
|
25
|
31
|
43
|
42
|
45
|
45
|
53
|
44
|
38
|
47
|
|
2024/07
|
24
|
24
|
20
|
21
|
22
|
26
|
26
|
27
|
27
|
31
|
30
|
28
|
31
|
34
|
38
|
35
|
33
|
23
|
27
|
40
|
35
|
34
|
28
|
41
|
32
|
45
|
33
|
15
|
20
|
19
|
21
|
|
2024/06
|
19
|
29
|
28
|
24
|
20
|
18
|
24
|
28
|
32
|
28
|
22
|
32
|
40
|
32
|
25
|
22
|
23
|
26
|
24
|
27
|
21
|
20
|
20
|
15
|
16
|
22
|
24
|
28
|
23
|
26
|
|
|
2024/05
|
19
|
22
|
32
|
36
|
25
|
34
|
34
|
39
|
38
|
53
|
44
|
32
|
48
|
60
|
61
|
64
|
57
|
46
|
23
|
19
|
19
|
32
|
41
|
35
|
30
|
27
|
26
|
24
|
32
|
41
|
28
|
|
2024/04
|
58
|
48
|
36
|
38
|
19
|
19
|
20
|
29
|
41
|
45
|
46
|
63
|
56
|
47
|
51
|
53
|
57
|
39
|
44
|
27
|
19
|
29
|
27
|
35
|
41
|
33
|
41
|
34
|
39
|
32
|
|
|
2024/03
|
42
|
46
|
42
|
37
|
51
|
45
|
53
|
50
|
49
|
21
|
24
|
38
|
52
|
22
|
33
|
41
|
56
|
53
|
27
|
60
|
70
|
50
|
49
|
51
|
52
|
41
|
59
|
52
|
62
|
57
|
79
|
|
2024/02
|
54
|
40
|
35
|
22
|
21
|
19
|
15
|
20
|
36
|
115
|
74
|
65
|
60
|
63
|
61
|
28
|
47
|
50
|
52
|
45
|
45
|
31
|
22
|
23
|
21
|
19
|
17
|
16
|
15
|
||
|
2024/01
|
77
|
60
|
33
|
46
|
55
|
68
|
51
|
59
|
26
|
36
|
44
|
49
|
60
|
76
|
84
|
69
|
56
|
59
|
66
|
42
|
25
|
21
|
37
|
49
|
52
|
52
|
33
|
32
|
30
|
36
|
47
|
|
2023/12
|
57
|
57
|
55
|
37
|
38
|
46
|
66
|
65
|
92
|
85
|
68
|
43
|
43
|
49
|
67
|
45
|
28
|
23
|
21
|
41
|
46
|
59
|
55
|
53
|
64
|
71
|
79
|
76
|
73
|
76
|
80
|
|
2023/11
|
56
|
60
|
66
|
56
|
53
|
41
|
38
|
54
|
49
|
34
|
25
|
23
|
23
|
21
|
28
|
30
|
61
|
60
|
69
|
70
|
74
|
72
|
67
|
68
|
69
|
76
|
81
|
68
|
65
|
44
|
|
|
2023/10
|
47
|
41
|
53
|
57
|
35
|
30
|
33
|
27
|
30
|
17
|
19
|
35
|
43
|
54
|
50
|
51
|
53
|
43
|
24
|
17
|
20
|
28
|
44
|
52
|
53
|
65
|
59
|
30
|
33
|
48
|
51
|
|
2023/09
|
41
|
34
|
22
|
32
|
41
|
38
|
27
|
20
|
20
|
17
|
20
|
25
|
30
|
16
|
14
|
24
|
36
|
32
|
30
|
38
|
57
|
44
|
43
|
41
|
39
|
41
|
49
|
41
|
44
|
47
|
|
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
11
|
12
|
13
|
14
|
15
|
16
|
17
|
18
|
19
|
20
|
21
|
22
|
23
|
24
|
25
|
26
|
27
|
28
|
29
|
30
|
31
|
- Excellent
- Good
- Lightly
- Moderately
- Heavily
- Severely
Air quality source: CNEMC
*: primary pollution