BRODY FORD Bloomberg News A post-pandemic boom in national park tourism has left lawmakers wondering how to preserve nature and the visitor experience amid increased traffic, crowds and waiting times. âYosemite is one of the most spectacular places in the world, but I can guarantee the people in that traffic jam werenât enjoying it,â said Sen. Angus King, I-Maine, while presenting a photo of a mountain road backup on Wednesday to the Senate Energy and Natural Resources subcommittee on National Parks. National park tourism has grown steadily for decades, particularly accelerating in the 2010s. After a brief pandemic lull, visitors have returned to seek fresh air, smashing monthly attendance records at parks such as Yellowstone and Zion. In June alone, over 31 million people visited a National Park Service site.