than the ultraviolet values for “ozone.” As nitrogen dioxide does not absorb in the same range as ozone, it could not be responsible for the high ultraviolet va1uc.s for “ozone.” The higher ultraviolet values could be explained if a sufficient concentration of reducing agent were present to reduce the chemicd oxidant readings. Sulfur dioxide would be a likely suspect. Data on sulfur dioxide concentrations have not been published along with t,hr “oxidant” v:ilues. so the possible importance of the sulfur dioxide is difficult to evaluate. Several chemical specirs. and especially peroxyxyl nitrite, may be responsihlc for the hig!ier results for “oxidantsJJ obtained chrmicnlly than by ultraviolet analysis. There is no dtafinite evidence as to the species rcsponsible for high ultral-iolpt results for ‘Lozonc.JJ
LITERATURE CITED
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