Fig. 5.
The PAH profiles for background, rural and urban locations (2: 2-ring PAH; 3: 3-ring PAH; 4: 4-ring PAH; 5: 5-ring PAH; 6: 6-ring PAH).
The PAH profiles for background, rural and urban locations (2: 2-ring PAH; 3: 3-ring PAH; 4: 4-ring PAH; 5: 5-ring PAH; 6: 6-ring PAH).