On a morning of July 1999, the lawn of a rural medical facility was sprayed with an organophosphate (Chlorpyrifos) without any warning to staff and patients. Patients waiting to enter the building were exposed due to proximity of spraying and windy conditions. A physician walked through a cloud of spray. Details about the concentration of pesticide used were not available but use of a high concentration was probable. Exposure was suspected to have continued inside the building through opened windows, air exchanger, and people movements through the doors.
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