When it comes to home air purifiers, HEPA filters are considered the best at removing at least 99.97 percent of airborne contaminants 0.3 microns in size, which is equivalent to MERV 16.

The recent wildfires in Altadena and Pacific Palisades have been contained, but wildfire impact on air quality is something Californians should prepare for.

The most commonly used system applies a MERV number (minimum efficiency reporting value) to each filter, which was developed by ASHRAE (formerly the American Society of Heating, Refrigerating and ...