Air Quality
Excellent
No health implications.
6
PM2.5
19
PM10
37
O3
0.6
CO
2
SO2
2
NO2
No health implications.
Advise
Everyone can continue their outdoor activities normally.
Air Quality
Today
14 Jun
37
Excellent
Sun
15 Jun
32
Excellent
Mon
16 Jun
42
Excellent
Tue
17 Jun
48
Excellent
Wed
18 Jun
43
Excellent
Thu
19 Jun
44
Excellent
Fri
20 Jun
33
Excellent
Air quality in the last 12 months (Cheung Chau)
|
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
|
|||
|
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
|
|
|
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