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Since Newark is a major port for all transportation methods, it indirectly produces a lot of air pollution because of most of these vehicles in result people living in areas close to the ports suffer more from air pollution in terms of health. 

In this article, the researchers from the Environmental Protection Agency (EPA) came up with a portable air sensor that can measure the levels of the particulate matter and nitrogen oxide in order to get data from the areas that are directly being affected by air pollution.