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Published at 9:19 a.m. on October 16, 2013
| Modified at 1:21 a.m. on October 25, 2013
Margaret Gearhart on Penn State's Visible Emissions Training Program, also known as Smoke School, which offers opacity training for people who want to become certified "smoke readers." Participants in the school, which is held at the Penn Stater Hotel, in University Park, Pa., are trained to visually read the opacity of industrial plumes and conduct tests in accordance with EPA Method 9. CDT/Nabil K. Mark
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