The node on Montalvin Elementary school sits 2 miles east of the Point Pinole Regional Shoreline, 1.5 miles west of 80 and less than a mile south of San Pablo Bay shore. Comparison of eastern nodes that sit adjacent to 80 provide insight into traffic and emission patterns along this route, as well as how these emissions disipate with distance from the freeway. Given its proximity to the water this node is also capable of recording changes in air quality related to events across the San Pablo Bay, including wildfires.