I did a search and didn't get results. My question concerns air quality. I read an OSHA study the other day about dust on large construction sites being the most dangerous problem existing. That made me wonder about our industry. I now wear a dust mask when conditions are dry, but in my earlier days I thought less of health and more of appearance. I know there is a lot of particulate matter in the air when we cut. To get to the point, are there any studies on this in the green inustry and does this concern any of you guys? Also have any of you guy's ever had respiratory problems from cutting?