... magnitude: pouring and cooling of molten iron, handling of sand used to make molds, shaking sand from the molds, cleaning and finishing of cast iron, and operating an induction furnace. The bulk ... equipment used. In the summer of 2001, we interviewed managers and engineers of the plants on our list (both in person and by telephone) in an attempt to obtain these data. Only two of the industrial ... carbon monoxide, and particulate matter less than 10 microns in diameter (PM10), and El Paso exceeds national ambient air quality standards for ozone, PM10, and carbon monoxide. An overwhelming...