While it’s known for its thick, dark, and glossy leaves, the rubber tree is another houseplant that can help filter air. According to Hurd, “Growing this plant indoors has several advantages, such as raising humidity levels thanks to its high transpiration rate, improving mood while lowering stress and anxiety, and purifying the air.” To care for this plant, Wight suggests wiping the rubber tree leaves often to maximize their ability to photosynthesize and ensure a bright indirect spot for this plant.