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Entrez PubMed ,./ VV Y' \~ Page 2 of2 TW A of3.3 mg/m3. For concrete wall grinding during new building construction the respirable quartz measurements ranged up to 0.66 mg/m3 for a 191-minute sample, resulting in an eight-hour TW A of 0.26 mg/m3. The air sampling results for concrete sawing ranged up to 14.0 mg/m3 for a 350-minute sample resulting in an eight-hour TW A of 10.0 mg/m3. During the milling of asphalt from concrete highway pavement, the sampling indicated a respirable quartz concentration ranging up to 0.34 mg/m3 for a 504-minute sample, resulting in an eight-hour TW A of 0.36 mg/m3. The results ofthis work indicate the potential for respirable quartz concentrations involving disturbance of concrete to range up to 280 times the NIaSH Recommended Exposure Limit (REL) of 0.05 mg/m3 assuming _) exposure for an eight- to ten-hour workday. Considering the aging of the concrete infrastructure in the United States, these results pose a challenge to all who have an interest in preventing silica exposures and the associated disease silicosis. PMID: 11871757 [pubMed - indexed for MEDLINE] ,...........................................................................................................................................................................................................................................,................................................................................................................................................................................... Display [,l\~~tr.~?~... ... I I 11 .....~*: Show .~~...*: .??~.~L . iii Send to II .... - ..... ....'. ........................... Write to the Help Desk NeBl1 NLM I NIH Department of Health & Human Services Privacy Statement I Freedom of Information Act I Disclaimer May 9200614:13:00 http://www.ncbi .nlm .nih.gov/ entrez/ query .fcgi? cmd=Retrieve&db=pubmed&dopt=Abstra... 5/21/2006