Name: Information by Location Index

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Description: Busy Roadway is defined as 25,000 or more vehicles per day travelling on a section of roadway. Refer to Washington State Department of Transportation - Annual Traffic Report found at: http://wsdot.maps.arcgis.com/home/webmap/viewer.html?webmap=927b5daaa7f4434db4b312364489544d to find the actual daily traffic for a section of roadway.Census Track is the most often used area to display data on Washington Tracking Network. The census tract map has a resolution of 500 feet, so finer scale boundaries are not seen. The 2010 census tracts were used in this analysis and display. Census track boundaries are updated every 10 years during the U.S. Census.Census Tracks are comprised of between 2 to1478 Census Blocks. 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. Air pollution from traffic and major roadways may also predispose children to adverse respiratory health outcomes. Long-term exposure to traffic-related air pollution can lead to increased risk of cardiovascular diseases.

Service Item Id: 85dd23768a7e49099af41c55d202b785

Copyright Text: WA Department of Transportation, WA DSHS, WA DOH, WA OSPI, WA DEL

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