The Evolution of Temporal and Spatial Patterns of Carbon Monoxide Concentrations in the Metropolitan Area of Sao Paulo, Brazil

Figure 5

Spatial distribution of the annual average of CO concentration during (a) 1997, (b) 2008, and (c) 2012. CO concentration is in ppm. Contour interval is 0.2 ppm. Obs.: Color scale is different between (a) and (b, c).

(a)

(b)

(c)