How do different methods of indoor air filtration compare in their effectiveness against Blue Lyme Grass pollen?

Several methods of indoor air filtration can help reduce allergens like Blue Lyme Grass pollen. They vary in effectiveness and some might be more suitable for your needs than others.

HEPA filters are often rated as the best. They are capable of capturing particles as small as 0.3 microns, including pollen from Blue Lyme Grass. The effectiveness of a HEPA filter also depends on its rating - it should have a rating of at least 13 on the MERV scale (Minimum Efficiency Reporting Value), which means it can filter out over 99.97% of pollen, dust, mold, bacteria, and other airborne particles.

Ionic air purifiers use ions to attract and capture allergens. While they can capture smaller particles than HEPA filters, they are less efficient at capturing larger ones such as pollen. The trapped particles often settle on surfaces in the room, so they must be cleaned regularly.

Ultraviolet Germicidal Irradiation (UVGI) cleaners use UV light to kill or neutralize airborne microbes and allergens. However, their effectiveness largely depends on the intensity and exposure time to the UV light. While they can kill microbes, they don't filter out particulates, so they are often used in combination with a particulate filter.

Activated Carbon filters can absorb gases and odors, but they don't filter out allergens so they are not very effective against pollen.

To conclude, based on their operational mechanisms and the size of Blue Lyme Grass Pollen, HEPA filters will likely provide the most effective filtration. However, for optimum results, consider a combination of methods such as HEPA with UVGI, or regular cleaning if you opt for an ionic purifier. Remember, regular maintenance of these systems, including filter replacements and cleaning, is critical for their effectiveness.