I have been researching particulate matter pollution and air filters. I read about HEPA air filters and that they can capture over 99% of particles in the air, including allergens. I was thinking that might mean HEPA air filters could really help with indoor air pollution and keep people healthier, especially in locations with high particulate matter, and especially in homes with fuel-based heating in the home. I assume this should help with asthma, allergies, and may help prevent the effects of particulate matter. But I don't see any actual studies that show this when I google the topic, I feel almost all the results are trying to sell me an air filter instead of giving a scientific explanation of the benefits.
Do HEPA air filters have a statistically significant impact on health?