The results of this first round of sampling show that while some contaminants were present, such as carbon monoxide, asbestos and silica, they have so far not exceeded any of OSHA's Permissible Exposure Limits, which can be found at: <a href="http://www.osha.gov/dsg/topics/pel/index.html.These">http://www.osha.gov/dsg/topics/pel/index.html.These</a> initial results should not be taken by employers as an all clear signal regarding potential exposure to health