What type of environmental problem does photochemical smog represent?

Photochemical smog is primarily classified as an air quality problem. This phenomenon occurs when sunlight reacts with pollutants such as volatile organic compounds (VOCs) and nitrogen oxides in the atmosphere, resulting in the formation of ground-level ozone and other harmful substances. The presence of these pollutants can lead to serious health issues, including respiratory problems and eye irritation, as well as adverse environmental effects such as harm to crops and ecosystems.

Recognizing photochemical smog as an air quality issue underscores the importance of monitoring air pollution levels and implementing strategies to reduce emissions from vehicles and industrial sources to protect public health and the environment. The other options relate to different environmental concerns; for example, solid waste management pertains to the handling and disposal of trash, water contamination addresses pollutants in water bodies, and soil degradation involves the decline of soil quality. These are distinct from the challenges posed by air pollution and photochemical reactions, highlighting why the correct classification is centered on air quality.