Washington State Department of HealthThis measure represents exposure to diesel emissions (NOx). This data is from the Washington State Department of Ecology's 2014 Comprehensive Emissions Inventory. The basis of the diesel NOx data is Washington State's Department of Ecology's 2014 Comprehensive Emissions Inventory. A detailed description can be found here: https://fortress.wa.gov/doh/wtn/WTNPortal#!q0=3632ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/cfea1f3da44c43008832ae9336d864d5_0engState of Washington Geospatial Open Data PortalPublicNOx-Diesel Emissions, Annual Tons/Km2 (Current Version) [Washington (State)]Web servicesWashington (State)Last Modified: 2018-01-14