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I <br /> r <br /> Upwind <br /> Anhydrous Ammonia @ 20,000 ppm can be in <br /> the form of a visible cloud and is fatal now! <br /> Note: what happens when anhydrous ammonia is released as an aerosol! <br /> Be sure class understands the difference between UPWIND and Downwind. <br /> Exam les windsocks, vapor, smoke, flags, and trees move / point downwind. <br />