To answer these questions, we combined data on air pollution, power plant activity, and demographics for every county in the U.S. from government sources. We used mapping tools and statistical analysis to look for patterns and connections. We found that counties with more fossil fuel energy generation have worse air quality, and that disadvantaged populations are more likely to live in those areas. These findings suggest that energy choices and environmental inequality are linked. Future research could look how shifting toward cleaner energy might improve air quality and reduce health risks, especially for communities that are already burdened.