Emission Control (other)
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Emission may refer to:


Chemical products

* Emission of air pollutants, notably: ** Flue gas, gas exiting to the atmosphere via a flue ** Exhaust gas, flue gas generated by fuel combustion **
Emission of greenhouse gases Greenhouse gas emissions from human activities strengthen the greenhouse effect, contributing to climate change. Most is carbon dioxide from burning fossil fuels: coal, petroleum, oil, and natural gas. The top contributors to greenhouse gas emi ...
, which absorb and emit radiant energy within the thermal infrared range * Emission standards, limits on pollutants that can be released into the environment * Emissions trading, a market-based approach to pollution control


Electromagnetic radiation

*
Emission spectrum The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to an electron making a atomic electron transition, transition from a high energy state to a lower energy st ...
, the frequencies of electromagnetic radiation generated by molecular electrons making transitions to lower energy states * Thermal emission, electromagnetic radiation generated by the thermal motion of particles in matter * List of light sources, including both natural and artificial processes that emit light * Emission (radiocommunications), a radio signal (usually modulated) emitted from a radio transmitter * Emission coefficient, a coefficient in the power output per unit time of an electromagnetic source * Emission line, or "spectral line", a dark or bright line in an otherwise uniform and continuous spectrum * Emission nebula, a cloud of ionized gas emitting light of various colors * Emission theory, a competing theory for the special theory of relativity, explaining the results of the Michelson-Morley experiment * Emission theory (vision), the proposal that visual perception is accomplished by rays of light emitted by the eyes


Other uses

* Thermionic emission, the flow of charged particles called thermions from a charged metal or a charged metal oxide surface, archaically known as the Edison effect * Ejaculation, the ejection of semen from the penis; also, specifically: ** Nocturnal emission, ejaculation experienced during sleep * Noise, emission * Exhalation of air, especially in the context of musical instruments


See also

* Emissions control (disambiguation) *
Emitter (disambiguation) Emitter may refer to: __NOTOC__ Devices which emit charged particles *Cathode, or negative electrode, in a vacuum tube or diode *Anode, or positive electrode, in certain applications based on the emission of ions from a solid surface *One of the t ...
*
Emit (disambiguation) Enzyme multiplied immunoassay technique (EMIT) is a common method for qualitative and quantitative determination of therapeutic and recreational drugs and certain proteins in serum and urine. It is an immunoassay in which a drug or metabolite in ...
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