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    Impact of Stratospheric Ozone on Tropospheric Concentrations

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    Estimates of the natural background levels of stratospheric ozone (O3) in the lower troposphere are made using both stratospheric mass-balance calculations and radioactive fallout data. There is excellent agreement between both approaches, suggesting that there is a natural background of O3 of approximately 20 percent of the federal 1-h max value (the concentration not to be exceeded for longer than 1 h) or roughly 30 μ/g. The maximum stratospheric O3 concentrations in the lower troposphere on occasion can approach, and even exceed, this federal guideline value.


    atmospheric circulation, ozone, fallout, troposphere, stratosphere

    Author Information:

    Reiter, ER
    Professor of Atmospheric Science, Colorado State University, Fort Collins, Colo.

    Committee/Subcommittee: D22.11

    DOI: 10.1520/STP36604S