This map is a fascinating and important image as it does NOT show the many sites of (ongoing) nuclear radiation contamination in communities impacted by uranium extraction and processing. For example, the Navajo Nation has around 270 unreclaimed open pit tailings piles. This is not official "waste" but is quotidian waste that creates longstanding environmental harm.
Newark is notably a more poor community then the rest of NJ. This alarming study comes to show that economic differences can affect the area you live. The problem is that these people probably didn't have enough money to settle anywhere else, and the prices of housing in the ironbound community must be cheaper then other places for the reasons cited, such as air pollution. The community is near the port and industrial area, so it's very hard to get away from the pollution. At least they are trying to keep an eye out for the problems of pollution, and with the help of the EPA, the ironbound community now monitors the air quality.