The crossword solution for the term 'PALE BLUE SHADE' is 'SMOKE'. SMOKE is a type of aerosol consisting of particles of solid or liquid matter suspended in the air. It is created by the burning of materials such as wood, coal, and tobacco. SMOKE can also be created through the use of chemicals, such as those used in fire extinguishers. SMOKE is often associated with a pale blue shade due to the presence of nitrogen dioxide in the atmosphere.