Why do natural sources usually have a more localized effect on acid rain than human sources?

Human activities, such as the combustion of fossil fuels in power plants and industrial facilities, are the primary drivers of acid rain. These human-generated pollutants, specifically sulfur dioxide and nitrogen oxides, are released into the atmosphere and can be transported over long distances, affecting regions far downwind from their original source.123

In contrast, natural sources of acid-forming compounds—such as volcanic eruptions and lightning—typically have a more localized impact. While these natural events do contribute to the formation of acids like sulfuric acid and nitric acid, their contribution to the overall phenomenon of acid rain is significantly less than that of human-made emissions. Because human industrial processes often involve continuous, large-scale emissions from tall stacks, the resulting pollutants are more effectively dispersed into the atmosphere, allowing them to travel across vast geographic areas before depositing as acid rain.13