Sentence examples for level of silica from inspiring English sources

One government study found that many workers in hydraulic fracturing, known as fracking, were exposed to 10 times the permissible level of silica.

We further found that the silica deposition could be well controlled by simply adjusting the level of silica source and the time for silica deposition.

However, no certain trend was found for the effect of replacement level of silica fume and zeolite on activation energy value of concrete.

For construction worksites and shipyards, the new standard will cut the allowable level of silica dust by an aggressive 80percentt.

They turned Spirit around for a closer look, finding high levels of silica, the main ingredient of window glass.

At Union Foundry, OSHA testers found that at least seven workers had been exposed to exceptionally high levels of silica in 1996.

[Daily News] Excessive levels of silica, a carcinogen linked to lung disease, were found at the Second Avenue subway construction site during a safety inspection.

Authorities are concerned that if an airplane moves through the ash cloud, which contains high levels of silica, a glasslike dust, the engines could seize or stall.

Dr. Smetacek suggests that the new results would apply anywhere in the ocean where high levels of silica are present to allow diatoms to bloom.

A proposed rule that would prevent workers from being exposed to dangerous levels of silica dust on the job has remained mired at the Office of Management and Budget for more than two years.

Nephrologist Ajay Singh of Harvard Medical School in Boston has found high levels of silica, present in some pesticides, in the region's drinking water, and thinks it could be responsible.