Air Quality
Excellent
No health implications.
6
PM2.5
16
PM10
27
O3
0.5
CO
6
SO2
22
NO2
No health implications.
Advise
Everyone can continue their outdoor activities normally.
Air Quality
Today
29 Mar
39
Excellent
Sun
30 Mar
47
Excellent
Mon
31 Mar
53
Good
Tue
1 Apr
52
Good
Wed
2 Apr
57
Good
Thu
3 Apr
58
Good
Fri
4 Apr
34
Excellent
Air quality in the last 12 months (Hong Kong)
|
2025/02
|
21
|
17
|
13
|
14
|
36
|
33
|
25
|
40
|
45
|
42
|
29
|
21
|
39
|
39
|
26
|
49
|
40
|
62
|
37
|
35
|
38
|
31
|
20
|
21
|
48
|
50
|
28
|
27
|
|||
|
2025/01
|
52
|
61
|
50
|
45
|
52
|
57
|
45
|
58
|
57
|
46
|
44
|
28
|
34
|
37
|
51
|
62
|
52
|
53
|
47
|
47
|
35
|
49
|
42
|
20
|
24
|
21
|
18
|
33
|
52
|
37
|
30
|
|
2024/12
|
36
|
40
|
36
|
28
|
49
|
59
|
56
|
35
|
28
|
28
|
43
|
36
|
38
|
54
|
47
|
43
|
47
|
48
|
52
|
58
|
48
|
52
|
61
|
58
|
56
|
43
|
63
|
59
|
63
|
57
|
61
|
|
2024/11
|
33
|
29
|
39
|
47
|
44
|
53
|
41
|
39
|
41
|
37
|
39
|
39
|
28
|
13
|
11
|
22
|
17
|
30
|
15
|
8
|
14
|
26
|
29
|
36
|
37
|
18
|
31
|
33
|
32
|
35
|
|
|
2024/10
|
29
|
29
|
40
|
36
|
41
|
39
|
39
|
42
|
39
|
32
|
27
|
38
|
25
|
25
|
24
|
23
|
25
|
27
|
37
|
19
|
38
|
26
|
29
|
40
|
45
|
45
|
45
|
22
|
28
|
39
|
41
|
|
2024/09
|
13
|
17
|
34
|
27
|
22
|
13
|
22
|
15
|
13
|
21
|
27
|
20
|
20
|
20
|
31
|
15
|
20
|
21
|
30
|
22
|
16
|
15
|
12
|
11
|
23
|
27
|
27
|
33
|
23
|
35
|
|
|
2024/08
|
24
|
27
|
20
|
21
|
31
|
25
|
30
|
18
|
15
|
17
|
20
|
16
|
18
|
13
|
15
|
13
|
15
|
17
|
16
|
14
|
13
|
24
|
27
|
22
|
14
|
16
|
19
|
32
|
35
|
24
|
15
|
|
2024/07
|
22
|
23
|
12
|
12
|
12
|
11
|
11
|
16
|
10
|
10
|
10
|
9
|
11
|
12
|
12
|
12
|
12
|
13
|
14
|
15
|
15
|
12
|
12
|
18
|
27
|
24
|
18
|
10
|
11
|
8
|
13
|
|
2024/06
|
16
|
23
|
22
|
25
|
21
|
23
|
12
|
11
|
12
|
14
|
19
|
23
|
22
|
24
|
18
|
22
|
18
|
19
|
17
|
13
|
18
|
24
|
10
|
12
|
15
|
14
|
13
|
13
|
11
|
18
|
|
|
2024/05
|
21
|
26
|
29
|
21
|
15
|
19
|
36
|
32
|
34
|
29
|
29
|
35
|
32
|
23
|
28
|
37
|
35
|
27
|
29
|
16
|
15
|
22
|
11
|
12
|
16
|
17
|
20
|
18
|
28
|
17
|
16
|
|
2024/04
|
51
|
49
|
23
|
20
|
42
|
27
|
25
|
35
|
18
|
30
|
37
|
35
|
33
|
21
|
29
|
28
|
24
|
19
|
24
|
24
|
16
|
23
|
20
|
34
|
17
|
20
|
30
|
16
|
20
|
25
|
|
|
2024/03
|
18
|
22
|
33
|
36
|
36
|
45
|
36
|
34
|
50
|
30
|
25
|
16
|
58
|
59
|
60
|
60
|
49
|
34
|
21
|
50
|
49
|
53
|
42
|
25
|
25
|
52
|
26
|
36
|
47
|
35
|
27
|
|
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