Companies or industries submit detailed reports of toxic pollutants that are manufactured, processed, or eliminated as its waste every year in TRI. It is the Environmental Protection Agency's (EPA) rule since 1988 for every company to disclose their toxic release inventory (TRI) data every year. This rule has indirectly helped in reducing the waste produced by companies and industries . TRI data from 1987 to present for any state can be downloaded from the website. Industries, types of industries, and coordinates of industries were extracted to make the hot-spot map.