01	Air Pollution and Control	Air pollution from sources such as flue gases, exhaust gases, odors, dust, smog and microorganisms; Control techniques and equipment; Sampling and analytical techniques and equipment; Waste gas recovery; Biological, ecological and socio-economic effects; Air pollution chemistry. For effect on public health, See 24/07, Environmental Health and Safety. For pesticides and radioactive contaminants, See 24/05, Pesticides Pollution and Control, and 24/06, Radiation Pollution and Control.
02	Noise Pollution and Control	Pollution in the environment by noise from any acoustic source including engine noise, traffic and transportation noise, machinery noise, industrial noise, urban noise, sonic boom; Theory and devices for control; Noise detection and measurement; Biological, ecological and socio-economic effects. For the effects on public health, See 24/07, Environmental Health and Safety.
03	Solid Wastes Pollution and Control	Pollution by solid wastes including garbage, scrap, junked automobiles, spoil, sludge, containers; Disposal methods such as composting, injection wells, incineration, and sanitary landfills; Mining wastes; Materials separation, processing and recovery; Recycling; Biological, ecological and socio-economic effects. For the effects on public health, See 24/07, Environmental Health and Safety. For the disposal of pesticides and radioactive contaminants and wastes, See 24/05, Pesticides Pollution and Control, and 24/06, Radiation Pollution and Control, respectively.
04	Water Pollution and Control	Water pollution by municipal, agricultural and industrial wastes, mine waters, radioactive contaminants; Chemistry and analysis of pollutants; Thermal pollution; Oil pollution; Control techniques and equipment; Sewage treatment including the design and construction of sewers and drinking water treatment facilities; Biological, ecological and socio-economic effects; Waste water reuse. For the effects on public health, See 24/07, Environmental Health and Safety. For pollution by pesticides and radioactive contaminants, See 24/05, Pesticides Pollution and Control, and 24/06, Radiation Pollution and Control, respectively.
05	Pesticides Pollution and Control	Pollution by insecticides, herbicides, fungicides; Decomposition studies; Analysis and detection; Biological, ecological and socio-economic effects. For the effects on public health, See 24/07, Environmental Health and Safety.
06	Radiation Pollution and Control	Pollution of the environment by particle and electromagnetic radiation from electric fields, magnetic fields or natural and man made sources including neutrons, x-rays, ultraviolet radiation, microwaves, alpha particles; Sampling and analytical techniques; Radioactive fallout; Biological ecological and socio-economic effects. Includes controlled disposal of radioactive wastes from nuclear reactors. For the effects on public health, See 24/07, Environmental Health and Safety.
07	Environmental Health and Safety	Effects of pollution on public health and safety; Industrial medicine and health. For pollution effects on plants and animals, see narrower categories in Field 24, Environmental Pollution and Control. See also 13/12, Safety Engineering.