That is good shape in my opinion.They look like that in a couple days. Good for another year at least. Depends on the circulation as well. H
Looks pretty good. Change the filter at 30K mile intervals or sooner - hold the filter up to the sun and if you cannot see light coming through, then change it.
If you have access to compressed air, give it a light hosing off. If you ate too aggressive you will shred it, but your pic still indicates it has plenty of use left in it!
Use extra caution if you haven't replaced your air filters prior to Spring 2011 and you live on west coast of the US, or anywhere downwind of Fukishima... Air filters in the Seattle area did test positive for elevated levels of radioactive particles due to the initial pulse of material released into the atmosphere during the quadruple reactor meltdown in Japan. You really don't want to use compressed air on that kind of dust because it's more likely to get into your lungs. Of course if you have a K&N air filter you can use their liquid cleaning solution, which will ensure you sending hot particles down the drain rather than back into the atmosphere. (YET ANOTHER REASON TO USE K&N FILTERS) Here's a bit more info: Scientist Marco Kaltofen Presents Data Confirming Hot Particles | Fairewinds Energy Education
I would like to see them put pressure sensors in air cleaners so that when the pressure drop across the element reached the design limit for that vehicle the driver would get a change air filter notification. An installed sensor should be well under $20 on the production line and the computing power and display capability is already in the car. Some absolutely horrid cruddy looking filter elements still have acceptable pressure drops, and some that don't look as bad should be replaced.
