Figure 1

Arsenic occurrence in North America and documented relationship with different cancer types. A) Light red circles on the map represent Canada provinces and US States affected by arsenic concentrations over 10μg/L. Estimations were made on the basis of data obtained from Health Canada [10] and the US Geological Service [11]. Please note that circled areas are approximations only; for detailed information, see references. States in red indicate evidence of arsenic exposure and higher cancer incidence, based on published literature. B) Histogram representing maximum concentrations detected in countries with evidence of arsenic exposure and cancer relationship (blue) [12] and in provinces/states of Canada and United States (light red) [10, 11].