Air Quality
Excellent
No health implications.
20
PM2.5
45
PM10
84
O3
0.5
CO
7
SO2
21
NO2
No health implications.
Advise
Everyone can continue their outdoor activities normally.
Air Quality
Today
23 Feb
99
Good
Mon
24 Feb
61
Good
Tue
25 Feb
78
Good
Wed
26 Feb
91
Good
Thu
27 Feb
99
Good
Fri
28 Feb
110
Light
Sat
1 Mar
39
Excellent
Air quality in the last 12 months (Chang'an)
|
2025/01
|
120
|
88
|
113
|
121
|
91
|
90
|
93
|
79
|
83
|
82
|
63
|
90
|
102
|
82
|
55
|
67
|
119
|
95
|
94
|
126
|
202
|
237
|
228
|
156
|
64
|
85
|
79
|
109
|
321
|
280
|
236
|
|
2024/12
|
68
|
95
|
92
|
74
|
68
|
64
|
71
|
58
|
77
|
107
|
133
|
136
|
49
|
62
|
57
|
83
|
109
|
85
|
116
|
160
|
72
|
67
|
87
|
94
|
95
|
95
|
87
|
66
|
91
|
64
|
85
|
|
2024/11
|
80
|
60
|
63
|
53
|
78
|
114
|
138
|
154
|
129
|
110
|
149
|
163
|
134
|
66
|
64
|
53
|
16
|
27
|
61
|
49
|
54
|
89
|
144
|
141
|
36
|
52
|
77
|
74
|
54
|
49
|
|
|
2024/10
|
46
|
48
|
51
|
55
|
92
|
92
|
65
|
130
|
89
|
60
|
92
|
110
|
80
|
58
|
69
|
45
|
84
|
59
|
42
|
36
|
35
|
29
|
47
|
71
|
106
|
65
|
39
|
51
|
92
|
107
|
77
|
|
2024/09
|
59
|
60
|
45
|
50
|
35
|
52
|
32
|
31
|
51
|
47
|
58
|
45
|
45
|
36
|
51
|
52
|
55
|
55
|
47
|
35
|
28
|
56
|
69
|
95
|
82
|
111
|
82
|
62
|
31
|
33
|
|
|
2024/08
|
47
|
54
|
41
|
44
|
44
|
36
|
42
|
41
|
57
|
111
|
60
|
49
|
49
|
57
|
43
|
32
|
36
|
34
|
43
|
47
|
39
|
57
|
66
|
63
|
46
|
39
|
30
|
48
|
51
|
39
|
45
|
|
2024/07
|
21
|
32
|
35
|
41
|
30
|
35
|
38
|
12
|
33
|
41
|
39
|
42
|
44
|
35
|
48
|
46
|
14
|
31
|
28
|
33
|
35
|
37
|
54
|
73
|
83
|
65
|
57
|
52
|
41
|
22
|
33
|
|
2024/06
|
74
|
48
|
61
|
29
|
29
|
50
|
43
|
37
|
35
|
43
|
39
|
49
|
53
|
41
|
61
|
36
|
39
|
30
|
35
|
34
|
21
|
39
|
40
|
55
|
72
|
57
|
41
|
46
|
52
|
60
|
|
|
2024/05
|
38
|
56
|
36
|
35
|
34
|
53
|
61
|
66
|
42
|
46
|
80
|
58
|
72
|
68
|
77
|
66
|
61
|
65
|
48
|
42
|
53
|
54
|
46
|
46
|
45
|
29
|
59
|
58
|
30
|
52
|
71
|
|
2024/04
|
93
|
86
|
71
|
85
|
81
|
85
|
81
|
75
|
61
|
49
|
51
|
63
|
55
|
40
|
74
|
89
|
72
|
72
|
245
|
156
|
116
|
84
|
298
|
155
|
87
|
62
|
72
|
64
|
45
|
23
|
|
|
2024/03
|
60
|
52
|
82
|
122
|
118
|
79
|
98
|
80
|
97
|
95
|
62
|
72
|
68
|
85
|
59
|
324
|
178
|
77
|
130
|
110
|
104
|
117
|
107
|
44
|
35
|
75
|
112
|
76
|
56
|
79
|
92
|
|
2024/02
|
191
|
90
|
118
|
121
|
112
|
115
|
113
|
150
|
120
|
257
|
104
|
120
|
115
|
98
|
53
|
74
|
104
|
343
|
487
|
100
|
54
|
92
|
81
|
102
|
116
|
135
|
116
|
170
|
111
|
||
|
1
|
2
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3
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4
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5
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6
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7
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8
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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