Workers typically get dirty if they work at a job site for

Construction Area

Under Mines

Slaughter Houses

Explanation:

People who work in the construction industry, in the mines, or in slaughter houses, as labor, are most likely to get dirty on their job sites, because in such jobs, workers have to make contact with materials which can make them dirty. For example, on a construction site, workers use cement, sand, bricks, colors, etc which can put stains on their cloths and can make them dirty. In mines, e.g in coal mines, workers' hands, cloths, faces, etc, get black due to the interaction with the coal during the coal extraction. Similarly, workers in slaughter houses get dirty from the blood of the animals they slaughter.  

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