In chemistry, a substance that shows a visible change, usually of color, at a desired point in a chemical reaction. Indirect dischargers can be commercial or industrial facilities whose wastes enter local sewers. Any facility or building, property, road or parking area tthat attracts motor vehicle traffic and, indirectly, causes pollution. The breathable air inside a habitable structure or conveyance. Chemical, physical, or biological contaminants in indoor air.
Indoor climate can affect indoor air pollution.
Residues produced during manufacturing operations. Semi-liquid residue or slurry remaining from treatment of industrial water and wastewater. Practices that reduce the amount of any hazardous substance, pollutant, or contaminant entering any waste stream or otherwise released into the environment. Also reduces the threat to public health and the environment associated with such releases. Term includes equipment or technology modifications, substitution of raw materials, and improvements in housekeeping, maintenance, training or inventory control.