Effect of coal-fired power generation on visibility in a nearby national park |
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| Authors: | Jonathan Terhorst Mark Berkman |
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| Institution: | 1. Berkeley Economic Consulting, 2531 9th St., Berkeley, CA 94710, USA;2. Dept. of Mathematics, San Francisco State University, 1600 Holloway Ave., San Francisco, CA 94132, USA;1. Alma Mater Studiorum – Università di Bologna, Dipartimento di Ingegneria Civile, Chimica e dei Materiali, via Terracini 28, 40131 Bologna, Italy;2. SINTEF Technology and Society, Safety Research, S. P. Andersens veg 5, 7031 Trondheim, Norway;3. Health and Safety Laboratory (HSL), Major Hazards, Harpur Hill, Buxton, Derbyshire SK17 9JN, United Kingdom;1. School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK;2. School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK;3. School of Mathematics, University of Leeds, Leeds LS2 9JT, UK |
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| Abstract: | The Mohave coal-fired power plant has long been considered a major contributor to visibility impairment in Grand Canyon National Park. The permanent closure of the plant in 2005 provides the opportunity to test this assertion. Although this analysis, based on data from the Interagency Monitoring of Protected Environments (IMPROVE) Aerosol Network, shows that fine sulfate levels in the park dropped following the closure, no statistically significant improvement in visibility resulted. Difference-in-differences estimation was used to control for other influences. This finding has important implications for the methods generally employed to attribute visibility reductions to air pollution sources. |
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