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.