Sulfur dioxide in the air	Concentration of heavy particles in urban air	Chemical oxygen demand in water
Suspended particulate matter in the air	Lead from gasoline in the air	Lack of dissolved oxygen in rivers
Percentage of population without safe water	Carbon monoxide in the air	Carbon dioxide emissions per person
Urban waste per person	Concentration of lead in water	Percentage of urban population without sanitation
Fecal coliform in water	Nitrogen oxides in the air	Arsenic in water

Environmental Problems by Income Level
(Figure 13.1)

Figure 13.1 provides examples of the patterns between environmental harm and national income per person for different environmental issues. Press each of the issues shown in the table below to see the related panel highlighted in the graph above.
Press "Continue" when you are ready to move on. The "Reset" button will return you to the initial figure.