"With ideal conditions (a clear, calm night) a single aircraft (or UAV) using an aerosol generator to dispense a 100 kg anthrax payload (99 percent of this weight being the suspension material that allows the anthrax to be dispensed in this manner) could adequately cover a 300 km2 area (about the size of Washington, D.C.) and inflict between 1,000,000 and 3,000,000 deaths (assuming a population of 3,000 to 10,000 people per km2). According to a 1970 report by the World Health Organization, "Inhalation of one microscopic (anthrax) spore will result in death within 48 hours. Distributed appropriately, one gram would be enough to kill more than one-third of the population of the United States.""