Which factors are influential in the dispersion of air pollutants?

The dispersion of air pollutants is heavily influenced by weather conditions, topography, and urban development, making this the correct choice. Weather conditions, such as wind speed and direction, temperature, and humidity, play a critical role in how pollutants are transported and diluted in the atmosphere. For instance, strong winds can disperse pollutants over a larger area, while temperature inversions can trap them close to the ground.

Topography also affects dispersion. For example, mountains can hinder the flow of air, trapping pollutants in valleys, while flat terrains may allow pollutants to disperse more easily. Additionally, urban development influences how pollutants are generated and distributed. Cities often have concentrated sources of pollution, such as vehicles and industrial facilities, which can result in higher local levels of air pollution.

While the other options touch on relevant aspects, they do not encompass the primary physical and environmental factors that affect how air pollutants spread in the atmosphere. Economic status, for example, might influence pollution levels indirectly through industrial activity, but it does not directly alter dispersion characteristics like weather and geographic features do.