Air Quality
Excellent
No health implications.
26
PM2.5
42
PM10
146
O3
0.5
CO
7
SO2
13
NO2
No health implications.
Advise
Everyone can continue their outdoor activities normally.
Air Quality
Today
21 May
92
Good
Thu
22 May
83
Good
Fri
23 May
75
Good
Sat
24 May
84
Good
Sun
25 May
93
Good
Mon
26 May
93
Good
Tue
27 May
18
Excellent
Air quality in the last 12 months (Helan)
|
2025/04
|
33
|
52
|
134
|
64
|
45
|
114
|
83
|
104
|
49
|
66
|
298
|
109
|
68
|
46
|
127
|
124
|
91
|
59
|
91
|
119
|
137
|
84
|
63
|
44
|
58
|
72
|
51
|
47
|
88
|
167
|
|
|
2025/03
|
87
|
51
|
53
|
77
|
61
|
47
|
84
|
91
|
331
|
153
|
196
|
74
|
88
|
68
|
37
|
29
|
41
|
32
|
38
|
47
|
56
|
80
|
277
|
352
|
412
|
280
|
120
|
72
|
40
|
45
|
37
|
|
2025/02
|
94
|
26
|
26
|
29
|
30
|
78
|
45
|
39
|
68
|
85
|
76
|
58
|
82
|
61
|
55
|
66
|
63
|
57
|
35
|
54
|
68
|
31
|
31
|
55
|
74
|
75
|
68
|
70
|
|||
|
2025/01
|
148
|
67
|
65
|
86
|
60
|
44
|
56
|
44
|
42
|
51
|
59
|
89
|
136
|
31
|
39
|
57
|
80
|
69
|
90
|
111
|
97
|
91
|
90
|
118
|
52
|
37
|
53
|
102
|
296
|
230
|
162
|
|
2024/12
|
59
|
37
|
62
|
51
|
51
|
54
|
36
|
49
|
71
|
51
|
86
|
83
|
54
|
55
|
74
|
125
|
137
|
73
|
66
|
57
|
33
|
55
|
72
|
83
|
88
|
45
|
35
|
62
|
114
|
84
|
110
|
|
2024/11
|
81
|
94
|
58
|
47
|
58
|
81
|
103
|
136
|
102
|
67
|
61
|
65
|
75
|
83
|
80
|
42
|
42
|
50
|
70
|
111
|
91
|
75
|
109
|
57
|
33
|
61
|
58
|
40
|
46
|
58
|
|
|
2024/10
|
45
|
41
|
47
|
35
|
48
|
45
|
39
|
47
|
39
|
56
|
61
|
44
|
58
|
74
|
50
|
64
|
70
|
41
|
36
|
47
|
39
|
32
|
59
|
60
|
60
|
46
|
52
|
69
|
65
|
38
|
58
|
|
2024/09
|
36
|
33
|
41
|
30
|
40
|
35
|
35
|
37
|
47
|
47
|
28
|
38
|
23
|
22
|
24
|
47
|
53
|
66
|
65
|
48
|
23
|
30
|
56
|
53
|
36
|
42
|
70
|
71
|
52
|
49
|
|
|
2024/08
|
38
|
26
|
39
|
39
|
47
|
29
|
22
|
25
|
73
|
82
|
26
|
29
|
25
|
30
|
48
|
42
|
33
|
30
|
27
|
27
|
39
|
35
|
35
|
35
|
32
|
23
|
23
|
31
|
44
|
37
|
50
|
|
2024/07
|
38
|
41
|
35
|
40
|
66
|
56
|
34
|
35
|
46
|
43
|
54
|
54
|
56
|
36
|
31
|
27
|
27
|
33
|
32
|
91
|
166
|
68
|
78
|
202
|
53
|
41
|
37
|
31
|
35
|
50
|
48
|
|
2024/06
|
49
|
28
|
25
|
36
|
39
|
42
|
39
|
45
|
27
|
32
|
50
|
48
|
65
|
34
|
24
|
26
|
40
|
38
|
39
|
38
|
27
|
118
|
85
|
335
|
87
|
52
|
29
|
57
|
37
|
33
|
|
|
2024/05
|
39
|
39
|
24
|
35
|
41
|
52
|
33
|
55
|
31
|
118
|
86
|
34
|
43
|
135
|
56
|
72
|
81
|
76
|
173
|
66
|
60
|
49
|
50
|
83
|
63
|
40
|
37
|
41
|
62
|
41
|
35
|
|
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