Previous estimates of hydrogen fluoride fluxes from cooling and gypsum settling ponds associated with the manufacture of phosphate fertilizer are reviewed and a theoretical estimate based on vapor pressures of HF-H2O solutions is presented. The latter yields fluxes from 122 to 195 kg HF/day for a 450 metric ton P2O5/day plant. Sixty percent or more of the total plant release of HF is due to the ponds. Derived atmospheric residence times for HF (1 to 5 hr.) indicate that fluoride is dispersed throughout Central Florida (USA) at ppb levels in the particulate form and may be an environmental hazard to adjacent agricultural industry.