The investment of uncertainty into environmental standards fits
naturally with the notion of using risk (e.g. to human health) as a
major criteria. Specific consideration is given to data of ozone
pollution in the San Joaquin valley, Ca and to one facet of uncertainty
- measurement error; which may be estimated from the nugget of the
temporal variogram. Inferences may be made regarding the likelihood
that certain critical ozone levels have not been exceeded. 

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