The sand blasting!? Yes, it's really bad, but serious actually fact.

What an amazing industrial in Japan ! This video is now recently these years blast cleaning out yard site in local Japan, in actual fact, very rare case which is using "Sand" mainly composites SiO2 is very dangerous but not illegal on Japanese worker's low. There is all the difference between the top and bottom about abrasive blasting knowledge in Japanese engineers and workers.

fact.