I went on a ride this weekend at a park in NC. It was extremely dusty and dry. They hadn’t had rain in a while and the temp was in the low 90s. After getting home and washing the machines I decided to check the air filters to see how bad they were. I’m sure someone has seen worse but remember this was one day and about 30 miles! Anyway the Uni did it’s job and I found no trace of dust in the intake tube.