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Stay out of the plume and the ppm will be diluted outdoors enough to not hurt you...provided you aren't head down in the smoke all day, everyday.
The air quality testing we did showed that in the shop with fans moving some air nearby, the dilution was enough to be under the safe permissible limits set up by OSHA. I haven't checked the OSHA limits in several years now, so that may have changed (gotten tighter) since we were doing our testing. The only way to really KNOW is to test. Wear the collectors up near your shield to capture what you are actually breathing. If in doubt...Find an industrial hygienist who can perform the testing, analyze the data and report it the way OSHA wants it done.