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Definition
| a contaminant that directly enters the atmosphere; it is not initially formed by reactions of airborne substances |
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Definition
| a contaminant generated in the atmosphere by chemical reactions between primary air pollutants and natural components of air |
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Definition
| air contaminants made up of small particles suspended in the atmosphere |
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Definition
| a substance produced solely by human activity |
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Term
| chlorofluorocarbons (CFCs) |
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Definition
| synthetic substances previously used as aerosol propellants, cooling fluids, and cleaning solvents; CFDs lead to stratospheric ozone destruction through production of chlorine radicals |
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Definition
| a potentially hazardous combination of smoke and fog |
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Definition
| a potentially hazardous mixture of secondary pollutants formed by solar irradiation of certain primary pollutants in the presence of oxygen |
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Term
| electrostatic precipitation |
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Definition
| a pollution-control method in which combustion waste products are electorally charged and then collected on plates of opposite electric charge |
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Definition
| a pollution-control method in which the combustion of waste products passes into filters that trap particles too large to pass through |
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Definition
| a pollution-control method involving an aqueous solution that removes particles and sulfur oxides from industrial combustion processes |
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Term
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Definition
| for a reaction to occur, reactant molecules must collide in proper orientation with sufficient kinetic energy |
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Definition
| the minimum energy required for the successful collision of reactant particles in a chemical reaction |
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Definition
| the reaction chamber in an auto exhaust system designed to accelerate the conversion of potentially harmful exhaust gases to nitrogen gas, carbon dioxide, and water vapor |
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Definition
| atoms or molecules with unstable arrangements and numbers of electrons |
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Term
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Definition
| a region of significant thinning of the stratospheric ozone layer; it occurs seasonally, most prominently over the South Pole |
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