Kelly can discuss the following topics related to air purifiers and indoor air quality: --Air purifier efficacy. --Common indoor air pollutants (volatile organic compounds (VOCs), bacteria, viruses, smoke, pollen, and dust). --The effectiveness of air purifiers against a broad range of contaminants. --How air purifiers can maintain clean air over extended use. --Air purifier filter quality and air filter lifespans. --Energy consumption of air purifiers. --Clean air delivery rate (CADR). --VOC removal capabilities of air purifiers. --Air changes per hour (ACH). --EPA guidelines on air filter replacement.