Environmental Criteria and Assessment Office, Office of Health and Environmental Assessment, Office of Research and Development, Cincinnati, OH. 1993. U.S. Environmental Protection Agency. Ranking of Pollutants with Respect to Hazard to Human Health . The Merck Index. An Encyclopedia of Chemicals, Drugs, and Biologicals .
Aplastic anemia is a risk factor for developing acute nonlymphocytic leukemia.
Micrograms per cubic meter is the unit of measurement for chemicals in air.