Paralda, the only portable eco-friendly HEPA UV air purifier for the home, is ozone safe, meets Energy Star qualifications, and its powerful UV lamp lasts three to five years to sterilize airborne germs that cause the flu. New fall colors of the first “green” air purifier include Espresso, Twilight and Bamboo Green. $499; available nationwide at Target stores and at store.alencorp.com.