An air purifier's placement, whether on the floor or a table, depends on its design and intake mechanism. Most air purifiers are designed to sit on the floor and have bottom or side intakes, ensuring optimal airflow and pollutant capture. However, if the purifier has an intake at the top or is designed for tabletop use, placing it on a table can be effective. Regardless of placement, it's essential to ensure unobstructed airflow and keep the purifier away from walls or tight corners for maximum efficiency.