A banned pollutant is any substance that has been declared illegal to emit into the environment due to its negative effects on human health and the environment. NOISE, ASH, SMOG, and SOOT are all examples of pollutants that have been banned in many countries. NOISE is a type of sound pollution that can be caused by loud machinery or vehicles. ASH is a type of particulate matter that is created when something is burned. SMOG is a combination of smoke and fog that is created when pollutants mix with air. SOOT is a type of fine black powder that is created when something is burned. All of these pollutants have been banned in many countries due to their negative effects on human health and the environment.