Model AOD Date Obs. Beijing AO D Date Model Longfengshan Obs

Model AOD Date Obs. Beijing AO D Date Model Longfengshan Obs

4.0
4.0
Beijing
Obs.
3.5
3.5
Obs
Model
Longfengshan
Model
3.0
3.0
2.5
AOD
AOD
2.5
2.0
2.0
1.5
1.5
1.0
1.0
0.5
0.5
0.0
0.0
5
10
4.0
3.5
15
Date
20
25
5
30
3.5
3.0
2.5
2.5
AOD
AOD
3.0
2.0
1.5
1.0
1.0
0.5
0.5
25
30
Obs.
Model
20
25
30
20
25
Shangdianzi
0.0
0.0
5
10
15
20
25
5
30
10
15
Date
Date
4.0
4.0
Obs.
Datong
3.5
Model
3.0
3.0
2.5
2.5
AOD
AOD
20
2.0
1.5
3.5
15
Date
4.0
Gucheng
Obs
Model
10
2.0
Lanzhou
Obs.
Model
2.0
1.5
1.5
1.0
1.0
0.5
0.5
0.0
0.0
5
10
15
Date
20
25
30
5
10
15
Date
30