The EPA is requesting comment on a preliminary evaluation of the potential risks to children and other bystanders from volatilization of chlorpyrifos from treated crops. While there are uncertainties associated with EPA’s preliminary assessment, the available data indicate that vapor phase chlorpyrifos may be emitted from treated fields at levels resulting in exposure to children and others who live, work, attend school or otherwise spend time nearby. In some circumstances, these bystanders may be exposed to chlorpyrifos and/or the transformation product chlorpyrifos-oxon at concentrations that could cause adverse effects.
More information at http://www.epa.gov/oppfead1/
The chlorpyrifos preliminary volatility assessment, guide to commenters , and related documents are available in docket EPA-HQ-OPP-2008-0850 at www.regulations.gov.