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