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Combustible dust explosion hazards exist in a variety of industries, including food (e.g., candy, starch, flour, feed), plastics, wood, rubber, furniture, textiles, pesticides, pharmaceuticals, dyes, coal, metals (e.g., aluminum, chromium, iron, magnesium, and zinc), and fossil-fuel power generation.
-- Susan Brainard, Tampa, FL. According to the dictionary, dust is created by airborne particles of fine, dry matter from the surface of the ground. It seems like you can never get rid of it, whether or not windows are open -- although closed windows can help to prevent pollen and other pollutants from entering.