Over recent years, the focus of vehicle emission reduction has shifted from exhaust to non-exhaust emissions. Brake wear emissions are under regulation already, and obviously, the next priority will be tire wear emission reduction. Both brake and tire wear emission measurements pose a number of challenges with regards to test methods. Dekati has been at the forefront of brake and tire wear particle emission measurements, both in dyno and on-road testing. This presentation looks at actual test setups and measurement results carried out with the advanced Dekati HR-ELPI+ system, which is widely used for R&D and regulatory testing.