NYT Pollution that can change the colors of a sunset Crossword Clue Puzzle Answer from September 30, 2024

The crossword clue "Pollution that can change the colors of a sunset" from the September 30, 2024, edition of the NYT puzzle contains a 4-letter answer, which is SMOG. Smog, a mixture of smoke, fog, and other pollutants, can affect the appearance of sunsets by scattering and refracting sunlight, allowing longer wavelengths to dominate the sky. It is harmful to the environment and human health.