Definitely the dust already entered his lung.!!
It is ok just using towel to cover their mouth and nose from all that dust?
A piece of brick is not the same as a hard as safety helmet
This worker is grinding without any eye protection at all.
A small piece of debris can make him blind.
A masked man a.k.a welder
Another one masked man. Newspaper vs full face mask.!!
Just before they invented newspaper, still after they made full face mask for safety measure.
I let you think by yourself for this one