UV-B screening by tropospheric ozone: implications for the National Ambient Air Quality Standard

Article Abstract:

Tropospheric ozone is beneficial to health since it reduces human exposure to harmful ultraviolet-B radiation. According to estimates, a 10 parts per billion decrease in seasonal average concentrations of ozone would lead to increases in cancers and cataracts at a total annual cost of $0.29 billion to $1.1 billion. This health benefit of ozone should be considered in the EPA's recent proposal to tighten the National Ambient Air Quality Standard. A primary standard that would minimize the health effects of tropospheric O3, including the identifiable protective effects on cancers and cataracts should be established.

Health aspects, Tropospheric circulation

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The difficult challenges of attaining EPA's new ozone standard

Article Abstract:

The new 8-hour ozone standard set by the Environmental Protection Agency could prove difficult to achieve. The new standard, which replaces the 1-hour primary ozone standard, is set at 0.08 parts per million and defined as a concentration-based form that averages the annual fourth highest daily maximum 8-hour ozone concentrations over three years. Studies reveal that violating sites that experience high daily maximum 8-hour average concentrations will achieve faster declines than violating sites that experience daily maximum 8-hour average concentrations.

Air, water, & solid waste management, Environmental Protection Agency

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Science, uncertainty, and EPA's new ozone standards

Article Abstract:

The Environmental Protection Agency will announce, on Jul 19, 1997, its National Ambient Air Quality Standards for particulate matter and ozone. The proposed standards for ozone include new types of primary, or human health standards, and secondary, or vegetation standards. Uncertainty on the standards' attainability and scientific bases has raised interest from the federal government, the Congress and the media.

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