Minimum Efficiency Reporting Value, MERV, is a term used to signify how well indoor air particles between 0.3 and 10 microns are captured. The metric was developed by ASHRAE and spans between MERV 1 and MERV 16, with MERV 16 capturing the most pollutants. It is a common rating system for HVAC filters.
AirDoctor home HVAC filters are the best HVAC filters in the market with a MERV 14 rating! It removes 96% of particles 1-3 microns in size.