"Chlorine" is often not thought well upon in environmental contexts. Indeed, the previous Focus Issue on PCBs) promulgates such an association. Yet Cl-contain-ing molecules (including Cl_2, NaOCl, C1O_2) can be greatly credited with providing clean and healthy living to many. Waterborne diseases have been made rarities in regions that deliver water via a Cl-treated distribution infrastructure (both tap and bottle end points). The daily threat posed by untreated water is, for example, made glaringly clear by Pickering et al. in this issue(Environ Sci. Technol. DOI 10.1021/es903524m).
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