This highly effective True-HEPA Air Purifier from Honeywell captures 99.97% of the microscopic particles (0.3 microns and larger) that pass through the filters. It is efficient at capturing odours, airborne particles like dust, pollen and other allergens, tobacco smoke, cooking and fireplace smoke, pet dander and mould spores. True-HEPA filter technology is the golden standard in air purification and it is recommended for hay fever and allergy sufferers. Honeywell