Air Quality
Excellent
No health implications.
5
PM2.5
18
PM10
35
O3
0.6
CO
8
SO2
6
NO2
No health implications.
Advise
Everyone can continue their outdoor activities normally.
Air Quality
Today
18 May
39
Excellent
Tue
19 May
26
Excellent
Wed
20 May
26
Excellent
Thu
21 May
31
Excellent
Fri
22 May
28
Excellent
Sat
23 May
31
Excellent
Sun
24 May
23
Excellent
Air quality in the last 12 months (Xian'an)
|
2026/04
|
40
|
35
|
43
|
48
|
66
|
63
|
76
|
49
|
34
|
42
|
48
|
45
|
46
|
36
|
34
|
47
|
42
|
49
|
50
|
53
|
27
|
21
|
36
|
36
|
34
|
43
|
54
|
33
|
28
|
32
|
|
|
2026/03
|
26
|
35
|
54
|
67
|
75
|
64
|
69
|
70
|
79
|
62
|
47
|
56
|
53
|
50
|
104
|
20
|
18
|
29
|
44
|
61
|
42
|
53
|
59
|
71
|
59
|
56
|
62
|
53
|
54
|
36
|
33
|
|
2026/02
|
49
|
57
|
70
|
64
|
86
|
84
|
50
|
60
|
51
|
60
|
76
|
78
|
82
|
63
|
71
|
42
|
82
|
75
|
97
|
68
|
46
|
64
|
89
|
42
|
31
|
27
|
41
|
35
|
|||
|
2026/01
|
32
|
51
|
58
|
59
|
89
|
63
|
50
|
61
|
67
|
64
|
73
|
68
|
67
|
55
|
90
|
88
|
164
|
175
|
28
|
51
|
64
|
76
|
60
|
68
|
74
|
126
|
103
|
57
|
66
|
28
|
44
|
|
2025/12
|
72
|
100
|
65
|
72
|
95
|
70
|
89
|
120
|
101
|
103
|
121
|
105
|
39
|
47
|
51
|
56
|
138
|
137
|
76
|
142
|
73
|
46
|
53
|
88
|
73
|
62
|
73
|
68
|
66
|
108
|
99
|
|
2025/11
|
47
|
51
|
64
|
60
|
49
|
46
|
38
|
25
|
46
|
55
|
73
|
56
|
53
|
50
|
50
|
50
|
51
|
32
|
31
|
39
|
47
|
54
|
65
|
54
|
84
|
55
|
92
|
70
|
58
|
52
|
|
|
2025/10
|
34
|
36
|
31
|
41
|
53
|
37
|
42
|
43
|
41
|
48
|
62
|
70
|
43
|
49
|
53
|
29
|
40
|
12
|
12
|
25
|
21
|
30
|
40
|
42
|
57
|
62
|
62
|
54
|
62
|
72
|
48
|
|
2025/09
|
15
|
19
|
22
|
22
|
28
|
36
|
33
|
26
|
23
|
21
|
15
|
19
|
27
|
24
|
25
|
30
|
34
|
24
|
20
|
20
|
32
|
44
|
32
|
10
|
17
|
35
|
41
|
41
|
40
|
34
|
|
|
2025/08
|
32
|
35
|
39
|
34
|
28
|
21
|
13
|
12
|
20
|
29
|
14
|
16
|
26
|
21
|
11
|
16
|
18
|
25
|
20
|
15
|
14
|
15
|
14
|
17
|
15
|
20
|
20
|
17
|
26
|
32
|
16
|
|
2025/07
|
14
|
16
|
17
|
24
|
33
|
28
|
32
|
29
|
21
|
20
|
36
|
23
|
22
|
27
|
24
|
21
|
28
|
29
|
36
|
24
|
17
|
10
|
15
|
18
|
22
|
26
|
20
|
22
|
25
|
21
|
25
|
|
2025/06
|
12
|
20
|
38
|
42
|
33
|
31
|
25
|
12
|
20
|
22
|
22
|
21
|
20
|
19
|
29
|
40
|
27
|
15
|
12
|
18
|
15
|
11
|
16
|
18
|
21
|
23
|
15
|
13
|
11
|
16
|
|
|
2025/05
|
41
|
54
|
55
|
52
|
36
|
108
|
126
|
38
|
37
|
44
|
36
|
33
|
33
|
49
|
51
|
17
|
30
|
68
|
49
|
23
|
19
|
20
|
38
|
55
|
41
|
41
|
49
|
27
|
21
|
21
|
15
|
|
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