Air Quality
Excellent
No health implications.
5
PM2.5
12
PM10
32
O3
0.4
CO
7
SO2
9
NO2
No health implications.
Advise
Everyone can continue their outdoor activities normally.
Air Quality
Today
17 May
45
Excellent
Sun
18 May
47
Excellent
Mon
19 May
47
Excellent
Tue
20 May
42
Excellent
Wed
21 May
46
Excellent
Thu
22 May
41
Excellent
Fri
23 May
46
Excellent
Air quality in the last 12 months (New Territories)
|
2025/02
|
20
|
17
|
13
|
14
|
36
|
33
|
25
|
40
|
43
|
43
|
29
|
20
|
39
|
40
|
26
|
48
|
39
|
61
|
37
|
35
|
39
|
32
|
18
|
21
|
49
|
48
|
28
|
26
|
|||
|
2025/01
|
52
|
60
|
50
|
46
|
52
|
56
|
46
|
59
|
57
|
46
|
45
|
29
|
36
|
39
|
51
|
63
|
52
|
53
|
47
|
47
|
35
|
49
|
41
|
20
|
24
|
21
|
18
|
35
|
55
|
37
|
29
|
|
2024/12
|
37
|
40
|
37
|
30
|
50
|
59
|
54
|
33
|
27
|
29
|
44
|
34
|
37
|
55
|
47
|
43
|
48
|
47
|
52
|
58
|
47
|
53
|
60
|
58
|
55
|
41
|
62
|
59
|
63
|
56
|
60
|
|
2024/11
|
33
|
29
|
40
|
47
|
43
|
53
|
41
|
39
|
41
|
38
|
39
|
40
|
29
|
13
|
12
|
22
|
18
|
30
|
15
|
8
|
14
|
25
|
29
|
36
|
36
|
18
|
31
|
33
|
32
|
36
|
|
|
2024/10
|
28
|
28
|
39
|
35
|
40
|
38
|
39
|
42
|
39
|
32
|
28
|
39
|
26
|
26
|
25
|
24
|
26
|
27
|
37
|
20
|
38
|
25
|
29
|
41
|
45
|
45
|
45
|
21
|
28
|
39
|
41
|
|
2024/09
|
13
|
18
|
34
|
28
|
22
|
13
|
21
|
14
|
11
|
21
|
27
|
23
|
21
|
21
|
32
|
15
|
21
|
21
|
31
|
22
|
15
|
15
|
12
|
10
|
22
|
29
|
28
|
34
|
24
|
35
|
|
|
2024/08
|
23
|
26
|
20
|
22
|
31
|
26
|
32
|
19
|
16
|
17
|
20
|
17
|
19
|
15
|
15
|
14
|
16
|
17
|
17
|
14
|
13
|
26
|
29
|
22
|
15
|
18
|
20
|
33
|
35
|
25
|
16
|
|
2024/07
|
22
|
22
|
12
|
12
|
12
|
11
|
11
|
17
|
11
|
10
|
11
|
10
|
12
|
13
|
13
|
12
|
13
|
13
|
14
|
16
|
16
|
12
|
13
|
19
|
28
|
25
|
17
|
10
|
11
|
9
|
13
|
|
2024/06
|
15
|
24
|
21
|
24
|
21
|
21
|
12
|
11
|
12
|
13
|
19
|
23
|
23
|
24
|
17
|
21
|
18
|
19
|
17
|
13
|
18
|
23
|
10
|
12
|
14
|
14
|
12
|
13
|
11
|
18
|
|
|
2024/05
|
20
|
25
|
29
|
20
|
14
|
20
|
36
|
32
|
33
|
29
|
30
|
35
|
32
|
23
|
29
|
38
|
35
|
28
|
30
|
15
|
14
|
21
|
12
|
11
|
15
|
18
|
20
|
18
|
28
|
17
|
17
|
|
2024/04
|
51
|
49
|
23
|
20
|
42
|
26
|
26
|
34
|
18
|
30
|
38
|
36
|
34
|
22
|
30
|
29
|
24
|
21
|
24
|
23
|
15
|
24
|
20
|
34
|
17
|
21
|
30
|
16
|
20
|
25
|
|
|
2024/03
|
19
|
23
|
32
|
36
|
36
|
45
|
35
|
33
|
50
|
28
|
25
|
16
|
59
|
59
|
60
|
60
|
49
|
35
|
21
|
51
|
50
|
53
|
43
|
26
|
27
|
50
|
27
|
37
|
48
|
36
|
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