The main purpose of this legislation is to create a program called the Blue Whales and Blue Skies Program. This program aims to reduce air pollution, greenhouse gas emissions, harmful underwater noise, and the risk of fatal collisions between vessels and whales along the western coast of the United States. It encourages vessel operators to voluntarily slow down their ships in designated areas to achieve these environmental goals. Key provisions of the program include the establishment of guidelines for vessel speed reductions, which will be modeled after an existing program in California.