measuring the airborne concentrations
of incompletely cured isocyanates in the form of oligomers (aerosol) and isocyanate monomer (vapor) when removing recently cured paint by light abrasion (manual sanding).
The bacteria and fungi colonies were counted, and airborne concentrations
were reported as colony-forming units per cubic meter of air (CFU/[m.
Although there are significant difficulties in measuring airborne concentrations
of most bioaerosols, the health effects associated with exposure to aerosolized bacteria have received less research attention than those associated with exposure to other organic dusts, such as molds and animal allergens.
A new study reveals that as airborne concentrations
of fine dust particles climb, so do three blood factors that increase an individual's heart attack risk.
0], increasing airborne concentrations
and cleanup costs.
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
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.
Although significant, none of these drops were nearly as dramatic as the drop in airborne concentrations
Without ventilation, the 24-hour average airborne concentrations
of these VOCs often exceeded the 25 milligrams per cubic meter of air that can cause irritation, headaches, and other symptoms in healthy adults.