| http://www.w3.org/ns/prov#value | - In setting the standard level at 100 ppb rather than a lower level, the Administrator notes that a 1-hour standard with a level lower than 100 ppb would only result in significant further public health protection if, in fact, there is a continuum of serious, adverse health risks caused by exposure to NO 2 concentrations below 100 ppb and/or associated with area-wide NO 2 concentrations well-below
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