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		U.S. Forest Service uses kriging data developed by A.S.L. & Associates for 2000 through 2006 ozone estimates in the U.S. for the W126 and N100 exposure indices				Read the introductory materials and begin the process of better understanding how the science is integrated with the standard-setting processes
		EPA announces decision on 8-hour ozone human health and vegetation standards				Learn about the effects of ozone on biological systems and how to characterize hourly averaged ozone concentrations in biologically meaningful terms
		EPA's revised PM-2.5 standards and compliance deadlines				Bridging the gap between ozone exposure and ozone dose: The importance of high hourly average concentrations and "effective" dose
		How consistent would the W126 exposure index had been if it were selected as the form for the secondary ozone standard to protect vegetation?				Learn about background ozone levels and why theoretical modeling estimates underestimate actual background concentrations
		Background information on the W126 cumulative exposure index				A summary of concerns about the methodology utilized in the epidemiological studies for PM

		It is not clear that reducing ozone-causing emissions will result in the attainment of the 8-hour ozone standard at many locations in the US				Review the latest sulfur dioxide, ozone, pm-10, pm-2.5, carbon monoxide, and other maps
		Why a new human health standard may be needed to protect the public from ozone				Compare the Canadian  and U.S. 4th Highest 8-Hour Average Ozone Values for 2004-2006

	Spring 2005 in Montana	Summer 2005		February 2008 Yellowstone National Park
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Updated May 11, 2008
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