Pre weighted filter and matched weight filters made from polyvinyl chloride or mixed cellulose ester are suitable for respirable dust ( less than 10 micrometers in diameter ).
22.
Repace found an average level of respirable particles of 231 micrograms, or millionths of a gram, per cubic meter of air in the eight nightspots in Delaware.
23.
The ascospores, at 1.5 2.0 �m, are among the smallest reproductive particles produced by fungi, and are within the respirable size range.
24.
"' Respirable "'dust is sampled using a cyclone dust sampler design to sample for a specific fraction of dust AED at a set flow rate.
25.
British Coal failed to take all reasonable steps to minimize the creation and dispersion of respirable dust . . . from about 1949 to 1970 and to a lesser extent thereafter,
26.
Mine Safety Appliances in Pittsburgh won a $ 1.5 million contract from the Mine Safety & Health Administration in Denver, Colo ., for respirable dust filter assemblies.
27.
Silicosis is due to deposition of fine respirable dust ( less than 10 micrometers in diameter ) containing crystalline silicon dioxide in the form of alpha-quartz, cristobalite, or tridymite.
28.
For example, on 19 and 20 November 2006, roadside levels of respirable suspended particulates ( RSPs equivalent to PM 10 ) exceeded the WHO guidelines by at least 300 %.
29.
The respirable crystalline silica are particles less than 10 microns ( micrometers ), which are small enough to enter the part of the lungs were oxygen and carbon dioxide gases are exchanged.
30.
Acting Assistant Director of Environmental Protection ( Air ) Leung Pak-ming said that due to persistent low winds, the levels of nitrogen dioxide and respirable suspended particles had started to accumulate.
