Air Quality
Good
Some pollutants may slightly affect very few hypersensitive individuals.
13
PM2.5
63
*
PM10
44
O3
0.4
CO
11
SO2
9
NO2
Some pollutants may slightly affect very few hypersensitive individuals.
Advise
Only very few hypersensitive people should reduce outdoor activities.
Air Quality
Today
17 May
36
Excellent
Sun
18 May
37
Excellent
Mon
19 May
37
Excellent
Tue
20 May
34
Excellent
Wed
21 May
43
Excellent
Thu
22 May
45
Excellent
Fri
23 May
40
Excellent
Air quality in the last 12 months (Cheung Chau)
|
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
|
|||
|
2025/01
|
93
|
93
|
82
|
89
|
106
|
105
|
94
|
85
|
85
|
53
|
58
|
75
|
74
|
90
|
76
|
87
|
88
|
83
|
108
|
114
|
94
|
88
|
76
|
54
|
48
|
29
|
48
|
50
|
116
|
67
|
47
|
|
2024/12
|
79
|
85
|
80
|
74
|
80
|
75
|
46
|
37
|
55
|
61
|
52
|
39
|
49
|
59
|
58
|
71
|
77
|
65
|
61
|
72
|
80
|
78
|
90
|
81
|
81
|
80
|
86
|
83
|
83
|
85
|
99
|
|
2024/11
|
57
|
60
|
63
|
59
|
66
|
67
|
57
|
68
|
69
|
63
|
70
|
67
|
70
|
57
|
43
|
53
|
50
|
34
|
29
|
30
|
36
|
38
|
41
|
48
|
45
|
37
|
50
|
59
|
65
|
72
|
|
|
2024/10
|
41
|
38
|
53
|
54
|
54
|
58
|
62
|
54
|
46
|
49
|
60
|
64
|
71
|
70
|
52
|
42
|
49
|
50
|
37
|
33
|
47
|
49
|
31
|
48
|
56
|
52
|
37
|
30
|
36
|
49
|
62
|
|
2024/09
|
39
|
51
|
37
|
42
|
44
|
33
|
19
|
21
|
36
|
28
|
41
|
49
|
51
|
48
|
38
|
46
|
40
|
38
|
51
|
46
|
47
|
23
|
32
|
33
|
33
|
56
|
63
|
62
|
60
|
65
|
|
|
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
|
|
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