These data indicated that airborne concentrations
outdoors diminished quickly with time, with average concentrations less than one-fifth of the highest mean levels within 5-10 hr after spraying began, and less than one-tenth of the highest mean levels within 4 days of spraying.
During the application of the paints, the airborne concentrations
of isocyanates, in the breathing zone of the operator, were found to be less than < 0.
Streifel (1990), "Elevated Airborne Concentrations
of Fungi in Residential and Office Environments," American Industrial Hygiene Association Journal, 51:601-604.
aureus has historically been a significant problem only in hospitals, the urgent need for further study of the ambient airborne concentrations
and the role of airborne transmission of this organism in non-hospital environments is demonstrated by the increasing prevalence of methicillin-resistant S.
This can cause very high airborne concentrations
and severe acute health effects.
In addition, because of the expected low airborne levels, the use of stationary samplers allowed the use of higher flow rates, thereby increasing sampling efficiency and reducing analytical errors, which may have a greater impact at relatively low airborne concentrations
Although significant, none of these drops were nearly as dramatic as the drop in airborne concentrations
For reservoirs in some of the watersheds studied, however, PAHs never peaked and continue to climb--even though airborne concentrations
in these regions probably fell during the recent past.