Document r6kQYXa1yLvqqk3Eg9zdzOzav

Page 2413 1 Q Okay. I think one of the facts that you 2 mentioned that you would need, you would want to know 3 about the air flow of the work environment? 4 A Yes. 5 Q Could you explain to the jury what air flow 6 is? 7 A Sure. You go out and stand in the wind and 8 feel it on your face, that is air flow. It basically 9 is movement of air. 10 That very simple concept has a special place 11 in industrial hygiene because so much of what we worry 12 about as far as dangerous things is brought to us in 13 the air, and so what we try to do ordinarily if we are 14 setting up a control scheme, is to remove air away 15 from the people, in other words, to use ventilation, 16 to move air from the person toward the source of 17 contamination so that the dirt, the dangerous 18 materials don't get into the breathing zone and 19 potentially cause disease. 20 Q Is it a normal part of what you do as an 21 industrial hygienist in those instances when you can