What type of particles are most effectively removed by HEPA filters?

HEPA filters are designed to capture very small particles, specifically those that are 0.3 microns in diameter or larger. Pollens and mold spores typically fall within this size range, making them particularly well-suited for removal by HEPA filters. These filters can effectively trap allergens and biological contaminants, contributing to improved indoor air quality.

Large dust particles are often filtered by less specialized air filtration systems due to their larger size. Odors and gases, on the other hand, require different types of filtering mechanisms, such as activated carbon filters, since they cannot be captured by HEPA filtration alone. Thus, while HEPA filters are effective against a specific range of particle sizes, the focus on pollen and mold spores highlights their efficiency in handling biological and allergenic particulates. This makes option B the most accurate choice.