![tailpipe.jpg](https://assets1.cbsnewsstatic.com/hub/i/r/2021/06/07/a9636dd2-5bcc-4304-91c0-eaa72fe17329/thumbnail/640x360/064b1a2d8425ccaa6d4e9225e7bcae56/tailpipe.jpg?v=5710b2ed1cee1bdfd30cb9c02455b43d#)
Biden's clean-car rules face a crucial test as appeals court hears Republican-led challenges
Efforts by the Biden administration to limit tailpipe pollution from automobiles face a crucial test as legal challenges brought by Republican-led states head to a federal appeals court.