Can houseplants purify the air in your home?

Most people don't realise just how many pollutants are swirling around indoors, where they typically spend most of their time. For example, many of the products we use for cleaning and freshening our homes, schools and workplaces are adding invisible toxins to the air. "The smell of fresh is not a smell," says Anne Hicks, a paediatric pulmonary specialist at the University of Alberta. "If you can smell it, there's a chemical in the air that's getting up...