Silicosis is a deadly lung disease. Construction workers may get sick with silicosis if they breathe in too much respirable crystalline silica, a fine, sandy dust. Silicosis may take 10 or more years to develop when workers are exposed daily to low concentrations of silica dust. However, when exposures to silica are very high, symptoms can occur after only a few weeks to four to five years. To prevent silicosis, researchers from the National Institute for Occupational Safety and Health (NIOSH) urge construction workers to protect themselves from dust exposure when doing construction work, especially tuck pointing.