Air Quality
Excellent
No health implications.
4
PM2.5
7
PM10
36
O3
0.6
CO
7
SO2
7
NO2
No health implications.
Advise
Everyone can continue their outdoor activities normally.
Air Quality
Today
15 Aug
43
Excellent
Sun
16 Aug
42
Excellent
Mon
17 Aug
45
Excellent
Tue
18 Aug
43
Excellent
Wed
19 Aug
35
Excellent
Thu
20 Aug
38
Excellent
Fri
21 Aug
34
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