How big an area does an Ashleigh & Burwood Fragrance Lamp cover when it comes to killing coronavirus?

It depends on the length of time that the Lamp is in use, plus also additional factors such as airflow. We recommend for an average size room (20m2 floor size) to use the Lamp for 25-30 minutes (and it is important not to over-use the Lamp, because the fragrance release is extremely powerful, not to mention using up the fragrance rather too quickly).