Population density (millions inhabitants)
6
0
5
4
3
2
1
Surface CO mixing ration(ppbv)
50
CO emissions (Tg/year/(1deg x 1 deg))
0.05
0.15
0.1
0.25
0.2
0.3
100
150
200
250
300
Regional Air Quality,
Fig. 4 (Top) Population
density over China and
surroundings. All cities
with more than two million
inhabitants are indicated.
(Middle) MOPITT carbon
monoxide mixing ratios at
the surface level; average
measurements from March
2000 to June 2007.
(Bottom) The EDGAR
carbon monoxide emission
inventory for the year 2000.
All data are on a 1
 1
grid
(Clerbaux et al. [9])
Regional Air Quality
353