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Analysis of 8-Hour Ozone Concentrations in Cass County, Michigan; And Muskegon County, Michigan

By Environmental Protection Agency

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Book Id: WPLBN0000019672
Format Type: PDF eBook
File Size: 0.2 MB
Reproduction Date: 2007
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Title: Analysis of 8-Hour Ozone Concentrations in Cass County, Michigan; And Muskegon County, Michigan  
Author: Environmental Protection Agency
Language: English
Subject: Ecology, Natural resource issues, Environemtal protection
Collections: Environmental Awareness Library Collection
Publication Date:
Publisher: United States Environmental Protection Agency


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Agency, E. P. (n.d.). Analysis of 8-Hour Ozone Concentrations in Cass County, Michigan; And Muskegon County, Michigan. Retrieved from

Excerpt: On April 15, 2004, the U. S. Environmental Protection Agency (USEPA) designated areas as attainment (or nonattainment) of the 8-hour ozone standard. The nonattainment areas were sorted under either Subpart 1 or Subpart 2 of the Clean Air Act. The Subpart 2 areas are classified as marginal, moderate, serious, or severe based on the area’s 8-hour design value calculated using the most recent three years of data. Section 181(a)(4) of the Clean Air Act allows Subpart 2 nonattainment areas to be reclassified if that area would have been classified in another category if the design value in the area were five percent greater or less than the level on which the classification was based. For example, moderate nonattainment areas may be “bumped-down” to marginal nonattainment areas, if their design value is 96 ppb or less. In West Michigan, the following counties are eligible to be bumped-down from moderate to marginal: Cass County, Michigan (2001-2003 design value = 93 ppb); and Muskegon County, Michigan (95 ppb). The USEPA identified the following criteria to support a classification adjustment (bumpdown): request by state, discontinuity (i.e., reclassification must not result in an illogical or excessive discontinuity relative to the classifications of surrounding areas), attainment (i.e., show that the proposed area will be able to attain by the earlier date specified for the lower classification); emission reductions (i.e., show that the area will achieve the appropriate emission reduction necessary to attain by the earlier date); and trends. This paper contains information on ozone air quality, including trends in 8-hour ozone concentrations for the two counties in question, and modeling results for 2007, the attainment year for marginal nonattainment areas.

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