Air Quality
Excellent
No health implications.
27
PM2.5
42
PM10
76
O3
0.8
CO
6
SO2
27
NO2
No health implications.
Advise
Everyone can continue their outdoor activities normally.
Air Quality
Today
20 May
112
Light
Wed
21 May
102
Light
Thu
22 May
82
Good
Fri
23 May
71
Good
Sat
24 May
75
Good
Sun
25 May
35
Excellent
Mon
26 May
28
Excellent
Air quality in the last 12 months (Tongzhou)
|
2025/02
|
22
|
57
|
75
|
58
|
54
|
39
|
52
|
33
|
47
|
53
|
35
|
84
|
48
|
38
|
76
|
131
|
67
|
44
|
41
|
27
|
31
|
51
|
41
|
61
|
88
|
124
|
154
|
56
|
|||
|
2025/01
|
60
|
42
|
46
|
39
|
92
|
95
|
65
|
66
|
34
|
35
|
67
|
86
|
85
|
111
|
50
|
66
|
80
|
79
|
114
|
169
|
94
|
42
|
36
|
35
|
32
|
44
|
62
|
90
|
145
|
52
|
48
|
|
2024/12
|
73
|
90
|
53
|
33
|
87
|
147
|
134
|
37
|
46
|
37
|
73
|
44
|
68
|
58
|
65
|
82
|
98
|
71
|
39
|
63
|
92
|
43
|
42
|
59
|
93
|
111
|
52
|
60
|
77
|
83
|
78
|
|
2024/11
|
9
|
49
|
56
|
51
|
32
|
27
|
28
|
27
|
30
|
37
|
42
|
45
|
41
|
34
|
52
|
22
|
33
|
26
|
24
|
31
|
71
|
75
|
27
|
27
|
26
|
47
|
71
|
71
|
50
|
72
|
|
|
2024/10
|
18
|
27
|
18
|
22
|
16
|
8
|
10
|
36
|
35
|
52
|
71
|
59
|
26
|
19
|
47
|
36
|
28
|
34
|
25
|
26
|
21
|
30
|
43
|
28
|
29
|
22
|
18
|
44
|
27
|
24
|
21
|
|
2024/09
|
34
|
35
|
17
|
18
|
21
|
23
|
41
|
26
|
18
|
25
|
11
|
18
|
18
|
14
|
18
|
19
|
17
|
15
|
16
|
9
|
18
|
26
|
21
|
23
|
16
|
11
|
23
|
25
|
30
|
32
|
|
|
2024/08
|
32
|
32
|
41
|
29
|
32
|
25
|
30
|
32
|
28
|
39
|
37
|
33
|
40
|
18
|
18
|
26
|
20
|
14
|
12
|
22
|
25
|
44
|
38
|
24
|
18
|
16
|
27
|
24
|
16
|
18
|
22
|
|
2024/07
|
26
|
32
|
29
|
33
|
29
|
42
|
39
|
43
|
40
|
13
|
19
|
17
|
19
|
27
|
51
|
44
|
39
|
32
|
37
|
37
|
36
|
37
|
26
|
19
|
21
|
24
|
26
|
21
|
21
|
21
|
31
|
|
2024/06
|
58
|
33
|
48
|
43
|
28
|
23
|
25
|
23
|
41
|
35
|
15
|
20
|
38
|
29
|
27
|
27
|
16
|
26
|
16
|
24
|
35
|
19
|
32
|
39
|
38
|
17
|
23
|
27
|
28
|
12
|
|
|
2024/05
|
41
|
43
|
33
|
38
|
31
|
61
|
56
|
45
|
28
|
39
|
40
|
87
|
70
|
51
|
53
|
43
|
45
|
38
|
30
|
24
|
25
|
36
|
27
|
21
|
27
|
31
|
25
|
30
|
35
|
26
|
39
|
|
2024/04
|
69
|
32
|
32
|
64
|
44
|
50
|
46
|
45
|
64
|
61
|
50
|
28
|
19
|
23
|
38
|
44
|
58
|
89
|
88
|
34
|
23
|
26
|
46
|
49
|
47
|
30
|
20
|
19
|
26
|
44
|
|
|
2024/03
|
43
|
62
|
78
|
38
|
27
|
58
|
52
|
79
|
90
|
47
|
63
|
100
|
67
|
52
|
42
|
49
|
73
|
45
|
102
|
90
|
60
|
70
|
66
|
44
|
35
|
41
|
48
|
69
|
68
|
79
|
91
|
|
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