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		Ozone trends analyses of anthropogenically influenced monitoring sites in the United States and on worldwide background ozone signature monitoring sites				Read the introductory materials and begin the process of better understanding how the science is integrated with the standard-setting processes
		Trends in ambient ozone levels in the United States over the past several years illustrate the "flattening" effect.				Learn about the effects of ozone on biological systems and how to characterize hourly averaged ozone concentrations in biologically meaningful terms
		US Forest Service applies W126 and N100 kriged ozone data developed by A.S.L. & Associates				Bridging the gap between ozone exposure and ozone dose: The importance of high hourly average concentrations and "effective" dose
		How consistent will the W126 exposure index be if it is reconsidered 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
		The US EPA requests that the Court allow the Agency to determine whether ozone standards should be maintained, modified, or otherwise reconsidered over 180-day period.				Co-occurrence patterns of ozone, sulfur dioxide, daily PM-2.5, and nitrogen dioxide
		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 2005-2007

	Spring in Montana	Yellowstone National Park March 2009		Photographing the Performing Arts Worldwide
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A.S.L. & Associates
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Helena, Montana 59601
Office: 406-443-3389  Fax: 406-443-3303
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Updated July 3, 2009
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