Answer: SMOG

Smog refers to a type of air pollution that is characterized by a mixture of smoke and fog. It is a combination of pollutants, such as smoke, industrial emissions, and vehicle exhaust, that are trapped close to the ground. Smog is often exacerbated by certain weather conditions and can have harmful effects on human health and the environment. It is a significant air quality concern due to its negative impacts on respiratory health and visibility.

Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: Air pollution. Explanations are generated by AI and may be inaccurate.