Figure 1From: Fine particulate air pollution and its components in association with cause-specific emergency admissions Community and season-specific proportions of species to PM 2.5 mass for 6 selected species: Arsenic, Bromine, Chromium, Organic Carbon, Sodium, and Nickel. The seasons are: "black triangle" = winter; "black square" = spring; "star" = summer; "black circle" = autumn.Back to article page