The node on Nystrom Elementary sits 2 miles due east of the Chevron Richmond Refinery, and 1.3 miles north of 580. This among the southernmost nodes in the Richmond subnetwork. Comparison of the Nystrom node with the nodes on Washington Elementary and Peres Elementary schools provide insight into how quickly emissions from the Chevron refinery dissipate with distance. In addition, comparison of the data from other nodes that sit along 580 provides information about traffic and emissions patterns along this major Bay Area freeway.