Sites representing six categories of potential sources of EDB emission were sampled. The categories are: (1) gasoline mixing, storage, and transfer (refineries); (2) retail gasoline; (3) highly trafficked urban; (4) suburban residential (lightly trafficked); (5) rural; and (6) fumigation centers. Air samples collected near four different bulk loading stations had EDB levels at least twice that of background samples. The effect of heavily trafficked freeways on the EDB levels in two different cities was not discernible. However, EDB was detected in all samples taken in heavily trafficked urban areas. The ubiquitous nature of EDB is probably the result of the widely dispersed sources of emission in urban/industrial areas. The levels of EDB in air ranged from 0.05 to 0.10 microgram/cum in rural and suburban areas, and from 0.1 to 0.4 microgram/cum in metropolitan areas. Two fumigation centers where EDB was used to fumigate grapefruit were found to be significant sources of emission.

"Contract No. 68-01-2646"--T.p. "EPA 560/6-76-021"--T.p. "February 27 1976"--T.p. "U.S. Environmental Protection Agency." "EPA 560/1976 MRI/001." "MRI Project No. 3953-C." Includes bibliographical references. "Progress report on Protocol for sampling and analysis."

Sites representing six categories of potential sources of EDB emission were sampled. The categories are: (1) gasoline mixing, storage, and transfer (refineries); (2) retail gasoline; (3) highly trafficked urban; (4) suburban residential (lightly trafficked); (5) rural; and (6) fumigation centers. Air samples collected near four different bulk loading stations had EDB levels at least twice that of background samples. These levels ranged from 0.13 to 0.20 [mu]g/mp3s of EDB. The elevated levels were not discernible beyond 1/8 mile from the stations. The EDB concentration in air near pipeline pumping stations, lead mix blending facilities, and lead mix storage areas was not elevated above background. Air samples collected near clusters of gasoline stations in two cities had EDB concentrations ranging from 0.18 to 0.50 [mu]g/mp3s, which was 2 to 2.5 times greater than sampling sites 1/8 to 1 mile away. The third city had background levels ranging from 0.38 to 0.49 [mu]g/mp3s, and the effect of the gasoline stations was not discernible. The effect of heavily trafficked freeways on the EDB levels in two different cities was not discernible. However, EDB was detected in all samples taken in heavily trafficked urban areas. The ubiquitous nature of EDB is probably the result of the widely dispersed sources of emission in urban/industrial areas. The levels of EDB in air ranged from 0.05 to 0.10 [mu]g/mp3s in rural and suburban areas, and from 0.1 to 0.4 [mu]g/mp3s in metropolitan areas. Two fumigation centers where EDB was used to fumigate grapefruit were found to be significant sources of emission. The highest downwind ambient air level was 96 [mu]g/mp3s. The highest levels were observed when EDB was being exhausted from the fumigation chambers. However, levels higher than background were observed before the chambers had been purged. Levels inside the facility were 40 to 70 times greater than the highest ambient air levels; the highest level observed, 6,930 [mu]g/mp3s, was found using a personnel sampler placed on an employee. The average level of exposure inside the fumigation centers ranged from 370 to 3,100 [mu]g/mp3s.