Emissions Concern is a term used to describe the environmental issue of air pollution. It is caused by the release of pollutants such as SOOT and SMOG into the atmosphere. SOOT is a black or dark-colored solid substance made up of tiny particles that are released from burning fossil fuels, while SMOG is a type of air pollution created by the burning of fossil fuels and other chemical reactions in the atmosphere. Both of these pollutants can have serious health and environmental impacts, including respiratory illnesses, acid rain, and global warming.