#4 Add air-purifying indoor plants in the house and plant terrace garden. Houseplants like palms, peace lilies, ferns, schefflera, and anthuriums have such air-purifying properties that can curtail harmful toxins like acetone, ammonia, benzene, toluene and xylene. Houseplants also beautify the house along with spreading freshness and reducing the indoor temperature by 5-6 degree Celsius.