The spatial distribution of air quality nonattainment areas in the US is a result of

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The spatial distribution of air quality nonattainment areas in the US is a result of emissions, population, geographical features, as well as meteorological conditions. Emissions from transportation, industry, and agriculture are major contributors to air pollution. Areas with dense populations and urbanization also tend to have higher levels of pollution. Geographical features such as mountains and valleys can contribute to the concentration of pollutants, and meteorological conditions can affect how pollutants disperse and accumulate in certain areas. Therefore, all the factors mentioned in option D contribute to the spatial distribution of air quality nonattainment areas in the US.

The Spatial Distribution of Air Quality Nonattainment Areas in the US