Air Quality
Excellent
No health implications.
4
PM2.5
13
PM10
22
O3
0.4
CO
9
SO2
15
NO2
No health implications.
Advise
Everyone can continue their outdoor activities normally.
Air Quality
Today
5 Sep
36
Excellent
Sun
6 Sep
43
Excellent
Mon
7 Sep
57
Good
Tue
8 Sep
48
Excellent
Wed
9 Sep
55
Good
Thu
10 Sep
47
Excellent
Fri
11 Sep
29
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