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The smaller area of census block provides more precise numbers of where populations are distributed within a census tract.Exposure zone is the area of a census tract within 600 meters (300 meters on either side) of the busy roadway. An exposure zone of 300 meters was chosen after a review of the literature https://www.healtheffects.org/system/files/SR17TrafficReview_Exec_Summary.pdf Section 3.II.2.B. Also see Karner et al. (2010).Living near high traffic density may lead to increased exposure to noise, vibration and local landuse changes, in addition to traffic-related air pollution). Noise pollution from high traffic roads can also cause sleep disturbances leading to poorer quality of life. Exposure from traffic-related air pollution was associated with adverse health effects such as cardiovascular disease mortality, respiratory health and an increased risk of low birth weight. 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