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First of all I would like to highlight the first source used in the new. The map with the risk on air polution in Newark.

Now I'll point out the two qutes suggested:

"Air quality was analyzed using proximity to 5 factors: major roads, truck routes, rail lines, Newark airport are all nonpoint sources and facilities that have violated their major permit at least once within the last 3 years are point sources. Point sources were buffered 1 miles for the area of high risk, and 1.5 miles for the area of elevated risk."

(at the begging of the last paragraph)

"This project is an attempt to identify those areas of high risk and the people being affected by poor air quality. It can be used to inform the public about their risk and to influence policy makers and developers."

(the fourth paragraph)