The term 'Air Apparent' is a play on words of the phrase 'air apparent, ' which means something that is obvious or easily seen. The crossword solution for this term is 'SMOG, ' which stands for 'Smoke and Fog.' SMOG is a type of air pollution that is created when pollutants from burning fossil fuels mix with other pollutants in the atmosphere. It is a major environmental issue, as it can cause respiratory problems and other health issues.