Air Quality
Excellent
No health implications.
21
PM2.5
26
PM10
42
O3
0.5
CO
7
SO2
30
NO2
No health implications.
Advise
Everyone can continue their outdoor activities normally.
Air Quality
Today
19 Apr
56
Good
Sun
20 Apr
83
Good
Mon
21 Apr
58
Good
Tue
22 Apr
56
Good
Wed
23 Apr
70
Good
Thu
24 Apr
71
Good
Fri
25 Apr
34
Excellent
Air quality in the last 12 months (Ouhai)
|
2025/02
|
37
|
13
|
47
|
76
|
51
|
55
|
49
|
39
|
38
|
49
|
47
|
46
|
91
|
52
|
53
|
65
|
69
|
34
|
54
|
29
|
19
|
39
|
29
|
95
|
108
|
80
|
81
|
63
|
|||
|
2025/01
|
82
|
51
|
58
|
52
|
52
|
74
|
80
|
80
|
60
|
39
|
49
|
58
|
64
|
64
|
92
|
47
|
62
|
61
|
55
|
71
|
102
|
84
|
57
|
33
|
39
|
32
|
29
|
42
|
86
|
48
|
48
|
|
2024/12
|
55
|
60
|
62
|
59
|
53
|
33
|
40
|
69
|
39
|
54
|
27
|
35
|
18
|
102
|
90
|
59
|
54
|
66
|
39
|
35
|
61
|
65
|
49
|
51
|
51
|
84
|
122
|
66
|
66
|
58
|
72
|
|
2024/11
|
8
|
9
|
38
|
52
|
51
|
34
|
25
|
32
|
33
|
32
|
22
|
32
|
34
|
34
|
18
|
21
|
23
|
13
|
21
|
24
|
36
|
34
|
47
|
33
|
41
|
23
|
40
|
44
|
49
|
52
|
|
|
2024/10
|
19
|
15
|
20
|
19
|
22
|
17
|
14
|
12
|
36
|
45
|
56
|
49
|
39
|
51
|
36
|
25
|
40
|
43
|
30
|
15
|
38
|
39
|
21
|
40
|
28
|
23
|
19
|
16
|
50
|
43
|
24
|
|
2024/09
|
37
|
33
|
26
|
23
|
23
|
18
|
23
|
15
|
28
|
39
|
33
|
30
|
16
|
26
|
23
|
22
|
16
|
22
|
18
|
19
|
27
|
12
|
15
|
20
|
16
|
22
|
23
|
31
|
35
|
26
|
|
|
2024/08
|
31
|
40
|
42
|
43
|
29
|
28
|
40
|
39
|
41
|
41
|
52
|
46
|
40
|
32
|
26
|
31
|
24
|
23
|
17
|
20
|
21
|
27
|
40
|
43
|
33
|
29
|
42
|
28
|
37
|
30
|
33
|
|
2024/07
|
29
|
29
|
34
|
34
|
35
|
28
|
30
|
31
|
36
|
42
|
44
|
50
|
35
|
33
|
25
|
16
|
27
|
37
|
31
|
21
|
25
|
17
|
16
|
14
|
18
|
18
|
18
|
19
|
15
|
16
|
24
|
|
2024/06
|
9
|
14
|
25
|
44
|
45
|
12
|
21
|
37
|
34
|
22
|
27
|
32
|
30
|
46
|
21
|
22
|
17
|
19
|
40
|
52
|
42
|
47
|
54
|
25
|
19
|
27
|
44
|
30
|
25
|
29
|
|
|
2024/05
|
14
|
39
|
41
|
44
|
60
|
43
|
46
|
52
|
28
|
29
|
49
|
42
|
35
|
40
|
55
|
32
|
36
|
39
|
36
|
33
|
24
|
34
|
48
|
28
|
16
|
27
|
25
|
16
|
29
|
31
|
35
|
|
2024/04
|
50
|
53
|
47
|
30
|
38
|
41
|
34
|
41
|
34
|
58
|
60
|
47
|
40
|
27
|
42
|
54
|
42
|
37
|
89
|
81
|
64
|
25
|
30
|
40
|
43
|
62
|
51
|
35
|
39
|
21
|
|
|
2024/03
|
23
|
48
|
60
|
69
|
70
|
12
|
65
|
82
|
76
|
55
|
46
|
58
|
87
|
71
|
56
|
43
|
63
|
30
|
42
|
68
|
66
|
66
|
73
|
73
|
50
|
38
|
41
|
61
|
57
|
60
|
55
|
|
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