MicronAir Particle Cabin Air Filter, fits Honda Pilot 2003-2010 requires 1 filter, Odyssey 1999-2004 requires 1 filter and Acura MDX 2001-2006 requires 1 filter. Traps Harmful pollutants before they reach your vehicle's interior and provides cleaner air for allergy and asthma sufferers. Vehicle manufacturer recommends filter be changed every 6 to 12 months.