According to the National Park Service, air pollution is responsible for ____. a. increasing rates of soil erosion at U.S. national parks b. degrading scenic views in many U.S. national parks over 90% of the time c. causing acid rain in almost all U.S. national parks throughout the year d. causing frequent forest fires in U.S. national parks e. reducing tourism throughout the year at U.S. national parks, even when the air quality is good