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. 1994 Jul-Aug;99(4):361–367. doi: 10.6028/jres.099.034

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The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.

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Fig. 3 — Probability of classifying an area as being in nonattainment of the 24 h NAAQS for PM₁₀ based on an exponential distribution model of the tail.