PAG Air Quality staff completed the gridded on-road emissions mapping for the transportation network for 2000 (shown below) and for 2030. (Maps can be found in the Air Quality Report 2007. As expected, much of the pollution is emitted along the freeways and major arterial streets due to heavy traffic and at intersections, where cars idle. Detailed information with gridded maps for individual pollutants can be found in the 2000 On-Road Mobile Source Emissions Inventory.
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