A Northampton County dispatcher says about 100 firefighters from Northampton, Lehigh and Monroe counties responded to the stubborn fire.
Firefighters say the flames were hard to reach under piles of scrap metal and vehicles. The fire was fed by oil, plastic and rubber in the burning cars.
Residents who live near RPM say they had trouble breathing and complained of a burning oil stench.
A state Department of Environmental Protection spokesman says air tests showed that despite the smell, the air was safe.
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Information from: The Morning Call, http://www.mcall.com
