Air Quality
Excellent
No health implications.
6
PM2.5
16
PM10
30
O3
0.6
CO
7
SO2
22
NO2
No health implications.
Advise
Everyone can continue their outdoor activities normally.
Air Quality
Today
27 Aug
33
Excellent
Fri
28 Aug
43
Excellent
Sat
29 Aug
36
Excellent
Sun
30 Aug
30
Excellent
Mon
31 Aug
24
Excellent
Tue
1 Sep
34
Excellent
Wed
2 Sep
28
Excellent
Air quality in the last 12 months (Cheung Chau)
|
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
|
|
|
2025/08
|
33
|
34
|
30
|
36
|
28
|
27
|
28
|
31
|
49
|
54
|
57
|
54
|
48
|
46
|
22
|
29
|
35
|
19
|
22
|
27
|
27
|
38
|
41
|
34
|
27
|
33
|
50
|
34
|
36
|
27
|
37
|
|
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