Photochemical smog is characteristic of urban areas with many vehicles and a climate that is?

Photochemical smog develops primarily in urban areas that experience high levels of vehicle emissions combined with sunlight and warm weather conditions. The warmth promotes the chemical reactions between pollutants, such as nitrogen oxides and volatile organic compounds, leading to the formation of ground-level ozone and other secondary pollutants that characterize photochemical smog. The presence of sunlight is crucial, as it provides the energy needed for these reactions to occur efficiently. Warm and dry conditions often lead to stagnant air, which allows pollutants to accumulate, exacerbating smog formation. This is why urban areas with many vehicles, combined with a warm, dry, and sunny climate, are particularly prone to photochemical smog. In contrast, cooler, wetter, or foggy conditions do not favor the chemical reactions that create this type of air pollution, which makes them less likely to experience significant photochemical smog incidents.