Air Quality
Excellent
No health implications.
23
PM2.5
25
PM10
95
O3
0.5
CO
3
SO2
8
NO2
No health implications.
Advise
Everyone can continue their outdoor activities normally.
Air Quality
Today
18 May
52
Good
Tue
19 May
53
Good
Wed
20 May
63
Good
Thu
21 May
68
Good
Fri
22 May
80
Good
Sat
23 May
31
Excellent
Sun
24 May
30
Excellent
Air quality in the last 12 months (Cao County)
|
2026/04
|
50
|
59
|
56
|
66
|
84
|
77
|
67
|
44
|
39
|
63
|
62
|
56
|
37
|
39
|
55
|
62
|
78
|
75
|
67
|
83
|
59
|
36
|
41
|
39
|
40
|
50
|
92
|
55
|
47
|
54
|
|
|
2026/03
|
70
|
81
|
112
|
123
|
72
|
71
|
73
|
88
|
122
|
123
|
149
|
206
|
126
|
125
|
58
|
119
|
111
|
72
|
59
|
89
|
98
|
102
|
109
|
107
|
97
|
74
|
80
|
75
|
64
|
79
|
74
|
|
2026/02
|
113
|
157
|
131
|
116
|
168
|
66
|
62
|
70
|
63
|
84
|
124
|
97
|
125
|
109
|
110
|
50
|
103
|
85
|
88
|
71
|
63
|
355
|
119
|
43
|
52
|
68
|
123
|
116
|
|||
|
2026/01
|
44
|
75
|
102
|
110
|
249
|
99
|
54
|
69
|
68
|
93
|
55
|
71
|
100
|
188
|
96
|
113
|
69
|
52
|
51
|
36
|
55
|
81
|
114
|
150
|
191
|
164
|
205
|
114
|
114
|
125
|
118
|
|
2025/12
|
139
|
80
|
53
|
94
|
110
|
123
|
95
|
83
|
80
|
103
|
169
|
42
|
63
|
83
|
64
|
151
|
181
|
167
|
200
|
178
|
76
|
41
|
79
|
91
|
69
|
52
|
86
|
117
|
187
|
171
|
71
|
|
2025/11
|
115
|
89
|
60
|
83
|
102
|
76
|
66
|
90
|
73
|
77
|
63
|
78
|
121
|
168
|
164
|
146
|
40
|
53
|
58
|
86
|
156
|
92
|
82
|
112
|
60
|
112
|
243
|
126
|
100
|
130
|
|
|
2025/10
|
29
|
8
|
23
|
29
|
13
|
11
|
38
|
48
|
12
|
12
|
18
|
19
|
24
|
37
|
40
|
52
|
21
|
38
|
42
|
42
|
45
|
62
|
84
|
82
|
79
|
96
|
107
|
90
|
71
|
84
|
204
|
|
2025/09
|
26
|
32
|
34
|
40
|
42
|
35
|
50
|
20
|
25
|
34
|
25
|
20
|
44
|
30
|
24
|
15
|
22
|
22
|
12
|
25
|
40
|
29
|
17
|
25
|
35
|
28
|
19
|
18
|
33
|
37
|
|
|
2025/08
|
27
|
24
|
25
|
33
|
34
|
29
|
28
|
28
|
20
|
23
|
22
|
21
|
26
|
28
|
29
|
26
|
31
|
30
|
35
|
24
|
27
|
30
|
21
|
30
|
34
|
36
|
32
|
34
|
30
|
37
|
21
|
|
2025/07
|
20
|
30
|
22
|
25
|
32
|
36
|
39
|
34
|
22
|
49
|
57
|
37
|
40
|
44
|
40
|
42
|
35
|
35
|
44
|
34
|
21
|
26
|
21
|
28
|
29
|
29
|
27
|
26
|
18
|
34
|
37
|
|
2025/06
|
49
|
51
|
63
|
70
|
67
|
64
|
71
|
89
|
58
|
60
|
55
|
46
|
44
|
53
|
48
|
49
|
50
|
41
|
19
|
29
|
44
|
32
|
43
|
45
|
60
|
22
|
29
|
22
|
12
|
17
|
|
|
2025/05
|
58
|
89
|
47
|
50
|
106
|
118
|
78
|
66
|
42
|
28
|
51
|
54
|
55
|
60
|
64
|
85
|
130
|
81
|
92
|
68
|
63
|
68
|
71
|
57
|
53
|
55
|
59
|
60
|
57
|
66
|
70
|
|
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