Air Quality
Good
Some pollutants may slightly affect very few hypersensitive individuals.
45
*
PM2.5
67
PM10
10
O3
0.8
CO
9
SO2
24
NO2
Some pollutants may slightly affect very few hypersensitive individuals.
Advise
Only very few hypersensitive people should reduce outdoor activities.
Air Quality
Today
13 Oct
88
Good
Wed
14 Oct
86
Good
Thu
15 Oct
81
Good
Fri
16 Oct
71
Good
Sat
17 Oct
61
Good
Sun
18 Oct
61
Good
Mon
19 Oct
17
Excellent
Air quality in the last 12 months (Cheung Chau)
|
2026/08
|
21
|
17
|
22
|
19
|
22
|
41
|
50
|
36
|
41
|
34
|
44
|
51
|
32
|
24
|
22
|
46
|
41
|
27
|
27
|
26
|
19
|
29
|
27
|
24
|
30
|
21
|
17
|
33
|
28
|
23
|
22
|
|
2026/07
|
26
|
36
|
21
|
16
|
17
|
17
|
18
|
17
|
22
|
22
|
42
|
50
|
58
|
30
|
15
|
26
|
28
|
33
|
34
|
35
|
34
|
35
|
34
|
46
|
48
|
44
|
35
|
29
|
18
|
17
|
18
|
|
2026/06
|
52
|
45
|
50
|
45
|
33
|
29
|
24
|
23
|
22
|
30
|
43
|
51
|
26
|
24
|
18
|
24
|
18
|
19
|
23
|
30
|
29
|
30
|
35
|
38
|
26
|
23
|
27
|
42
|
26
|
23
|
|
|
2026/05
|
40
|
56
|
29
|
41
|
45
|
37
|
41
|
19
|
37
|
42
|
56
|
64
|
50
|
44
|
31
|
21
|
22
|
19
|
18
|
24
|
21
|
25
|
34
|
36
|
37
|
38
|
37
|
38
|
39
|
29
|
42
|
|
2026/04
|
26
|
39
|
59
|
26
|
40
|
62
|
59
|
50
|
44
|
44
|
48
|
48
|
41
|
42
|
35
|
36
|
35
|
44
|
47
|
50
|
40
|
38
|
18
|
24
|
48
|
57
|
47
|
39
|
26
|
26
|
|
|
2026/03
|
21
|
20
|
17
|
21
|
28
|
27
|
46
|
58
|
41
|
19
|
37
|
46
|
61
|
56
|
57
|
53
|
47
|
49
|
42
|
60
|
37
|
50
|
50
|
69
|
70
|
66
|
54
|
48
|
49
|
37
|
38
|
|
2026/02
|
33
|
48
|
61
|
69
|
71
|
66
|
34
|
30
|
44
|
51
|
29
|
29
|
48
|
60
|
55
|
40
|
39
|
35
|
46
|
56
|
65
|
57
|
45
|
48
|
37
|
59
|
31
|
23
|
|||
|
2026/01
|
50
|
34
|
39
|
56
|
43
|
42
|
51
|
57
|
58
|
68
|
61
|
63
|
73
|
75
|
78
|
82
|
80
|
78
|
75
|
55
|
33
|
33
|
35
|
56
|
65
|
68
|
47
|
53
|
60
|
52
|
30
|
|
2025/12
|
47
|
48
|
77
|
80
|
76
|
82
|
84
|
79
|
69
|
66
|
72
|
66
|
37
|
52
|
58
|
59
|
53
|
59
|
67
|
70
|
62
|
71
|
74
|
50
|
42
|
51
|
59
|
63
|
61
|
62
|
58
|
|
2025/11
|
41
|
42
|
30
|
20
|
27
|
40
|
33
|
30
|
23
|
23
|
23
|
44
|
43
|
41
|
54
|
53
|
54
|
41
|
40
|
44
|
52
|
52
|
60
|
63
|
53
|
65
|
65
|
74
|
68
|
58
|
|
|
2025/10
|
55
|
38
|
38
|
45
|
25
|
21
|
31
|
51
|
42
|
54
|
58
|
45
|
32
|
32
|
38
|
42
|
54
|
54
|
30
|
23
|
21
|
27
|
32
|
46
|
50
|
52
|
46
|
45
|
54
|
59
|
42
|
|
2025/09
|
36
|
37
|
49
|
57
|
50
|
48
|
46
|
19
|
24
|
26
|
26
|
38
|
44
|
47
|
44
|
32
|
38
|
45
|
43
|
41
|
24
|
23
|
26
|
20
|
19
|
26
|
39
|
39
|
39
|
45
|
|
|
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