The pie graph
above breaks down the different primary pollutants that make up the majority of air pollution
in the United States. The bar graph
displays the sources of each of these pollutants and at what percentage they occur for each source. For example, nearly 95% of particulate matter
(the dark green slice and bar) originates from the "construction, agriculture and unpaved roads" category, while only about 5% comes from the three other categories.