The term SOOTY DIRT is composed of two words, GRIME and DIRT. GRIME is a black or dark-colored substance made up of soot, smoke, DIRT, and other pollutants that accumulate on surfaces. It is often found on walls, windows, and other surfaces in urban areas. DIRT is any loose, dry material such as soil, sand, or gravel. Together, SOOTY DIRT is a combination of these two substances, which can be found in urban areas due to the accumulation of soot, smoke, and other pollutants.