Air Quality
Excellent
No health implications.
7
PM2.5
12
PM10
33
O3
0.5
CO
6
SO2
9
NO2
No health implications.
Advise
Everyone can continue their outdoor activities normally.
Air Quality
Today
3 Mar
42
Excellent
Wed
4 Mar
63
Good
Thu
5 Mar
72
Good
Fri
6 Mar
70
Good
Sat
7 Mar
70
Good
Sun
8 Mar
82
Good
Mon
9 Mar
36
Excellent
Air quality in the last 12 months (Cheung Chau)
|
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
|
|
2025/07
|
23
|
25
|
33
|
45
|
51
|
40
|
50
|
35
|
45
|
37
|
34
|
29
|
34
|
43
|
37
|
43
|
45
|
53
|
34
|
27
|
18
|
20
|
23
|
26
|
42
|
46
|
47
|
56
|
46
|
39
|
34
|
|
2025/06
|
41
|
39
|
27
|
42
|
49
|
40
|
37
|
32
|
45
|
26
|
24
|
19
|
18
|
19
|
24
|
23
|
21
|
24
|
25
|
21
|
24
|
24
|
29
|
32
|
36
|
30
|
22
|
25
|
27
|
23
|
|
|
2025/05
|
35
|
45
|
43
|
34
|
33
|
31
|
23
|
32
|
23
|
43
|
45
|
55
|
58
|
51
|
39
|
34
|
25
|
28
|
30
|
35
|
38
|
41
|
44
|
30
|
51
|
43
|
56
|
56
|
24
|
27
|
32
|
|
2025/04
|
40
|
64
|
76
|
71
|
93
|
79
|
79
|
78
|
76
|
80
|
58
|
104
|
239
|
168
|
127
|
107
|
91
|
70
|
52
|
47
|
59
|
46
|
35
|
43
|
25
|
35
|
52
|
35
|
55
|
62
|
|
|
2025/03
|
50
|
49
|
66
|
36
|
24
|
25
|
31
|
35
|
47
|
66
|
86
|
64
|
53
|
58
|
44
|
27
|
52
|
40
|
59
|
70
|
81
|
92
|
103
|
108
|
92
|
81
|
51
|
56
|
22
|
21
|
25
|
|
2025/02
|
45
|
29
|
20
|
30
|
48
|
58
|
30
|
58
|
58
|
62
|
73
|
61
|
59
|
78
|
99
|
53
|
42
|
43
|
66
|
69
|
29
|
39
|
23
|
38
|
68
|
93
|
72
|
64
|
|||
|
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