Air Quality
Excellent
No health implications.
19
PM2.5
33
PM10
87
O3
0.6
CO
5
SO2
12
NO2
No health implications.
Advise
Everyone can continue their outdoor activities normally.
Air Quality
Today
31 Jan
50
Excellent
Wed
1 Feb
51
Good
Thu
2 Feb
47
Excellent
Fri
3 Feb
37
Excellent
Sat
4 Feb
35
Excellent
Sun
5 Feb
37
Excellent
Mon
6 Feb
43
Excellent
Air quality in the last 12 months (Hong Kong)
|
2022/12
|
14
|
20
|
31
|
29
|
20
|
25
|
28
|
36
|
41
|
31
|
44
|
43
|
46
|
15
|
14
|
14
|
30
|
20
|
24
|
27
|
37
|
34
|
37
|
27
|
29
|
35
|
35
|
46
|
76
|
56
|
39
|
|
2022/11
|
30
|
17
|
24
|
33
|
17
|
23
|
14
|
17
|
29
|
27
|
20
|
18
|
33
|
33
|
31
|
30
|
25
|
25
|
32
|
37
|
26
|
25
|
17
|
21
|
21
|
16
|
32
|
21
|
13
|
17
|
|
|
2022/10
|
17
|
21
|
18
|
22
|
29
|
28
|
32
|
30
|
39
|
33
|
45
|
41
|
39
|
47
|
49
|
46
|
46
|
50
|
34
|
34
|
33
|
36
|
34
|
38
|
37
|
33
|
28
|
43
|
41
|
34
|
41
|
|
2022/09
|
38
|
30
|
45
|
37
|
54
|
53
|
32
|
35
|
57
|
53
|
60
|
68
|
68
|
72
|
73
|
92
|
66
|
53
|
49
|
44
|
45
|
37
|
45
|
40
|
53
|
44
|
26
|
24
|
25
|
14
|
|
|
2022/08
|
16
|
19
|
22
|
16
|
16
|
14
|
14
|
17
|
13
|
19
|
14
|
15
|
17
|
15
|
16
|
14
|
14
|
15
|
13
|
15
|
16
|
19
|
52
|
32
|
20
|
19
|
24
|
33
|
25
|
23
|
50
|
|
2022/07
|
17
|
22
|
30
|
32
|
23
|
21
|
16
|
14
|
10
|
13
|
13
|
12
|
12
|
12
|
14
|
16
|
21
|
19
|
15
|
14
|
12
|
21
|
20
|
25
|
31
|
21
|
16
|
26
|
39
|
34
|
60
|
|
2022/06
|
20
|
17
|
22
|
25
|
23
|
20
|
17
|
14
|
15
|
15
|
16
|
21
|
22
|
21
|
16
|
14
|
15
|
15
|
19
|
21
|
17
|
13
|
14
|
14
|
12
|
12
|
11
|
13
|
14
|
11
|
|
|
2022/05
|
21
|
21
|
32
|
39
|
33
|
34
|
32
|
36
|
36
|
21
|
14
|
13
|
13
|
19
|
25
|
20
|
28
|
42
|
34
|
32
|
30
|
33
|
28
|
22
|
21
|
19
|
17
|
18
|
16
|
15
|
17
|
|
2022/04
|
25
|
20
|
27
|
43
|
46
|
35
|
32
|
46
|
30
|
32
|
28
|
19
|
19
|
41
|
34
|
38
|
50
|
43
|
16
|
26
|
40
|
25
|
22
|
15
|
16
|
20
|
19
|
20
|
20
|
24
|
|
|
2022/03
|
31
|
48
|
46
|
38
|
37
|
40
|
37
|
27
|
29
|
30
|
29
|
28
|
30
|
22
|
17
|
26
|
20
|
46
|
45
|
30
|
40
|
32
|
16
|
18
|
26
|
27
|
27
|
16
|
18
|
29
|
26
|
|
2022/02
|
21
|
12
|
14
|
16
|
19
|
30
|
28
|
13
|
26
|
28
|
21
|
38
|
29
|
18
|
29
|
38
|
32
|
25
|
12
|
17
|
15
|
12
|
16
|
24
|
28
|
39
|
42
|
31
|
|||
|
2022/01
|
57
|
62
|
29
|
37
|
29
|
46
|
52
|
40
|
44
|
41
|
27
|
39
|
52
|
59
|
43
|
39
|
44
|
40
|
28
|
30
|
33
|
20
|
18
|
25
|
20
|
33
|
38
|
31
|
20
|
17
|
21
|
|
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