Emission
* Most emissions affect environments
  - health
  - human health
  - temperature
* Most emissions are caused by activities
  - human activities
  - the result of deforestation
* Most emissions contribute to air pollution
  - events
  - fine particulate pollution
  - increase precipitation
  - relate to human activities
  - stem from the burning of fossil fuels
* Some emissions associate with electricity
  - generate electricity
* Some emissions cause acid rain
  - generate transnational or even global damage
  - increase greenhouse effects
  - lead to depletion
  - directly proportional to the amount of product generated
  - egresses
  - flow
  - releases
* are the discharge of a substance
  - result of unburned fuel that is exhausted from the engine combustion chamber
* arising from such consumption are a major contributor to climate change - global warming.
* become concern
  - environmental concern
* become serious concern
* climb high into the atmosphere, borne on trade winds that circumnavigate the globe.
* contain toxic substances.
* generally occur at each stage of the fuel cycle.
* includes all processes which increase the radiant intensity.
  - with speed
* indicates that radiative energy is released by the material.
* interact in the environment - with the air, sunlight, and other chemicals.
* is emergence
  - enhanced by bombardment with neutrons
  - radiation produced, or the production of radiation, by a radio transmitting station
  - the term used when sperm moves into the urethra
* nebulae emit light at specific wavelengths depending on their chemical composition
  - shine by internally produced light
* originate from the burning of fuels and heating of feed materials.
* relate to activities
* require power.
* usually rise just after the combustion process in a combustion appliance begins.

### emission:

Atmospheric emission
* are non-toxic and meet all environmental regulations.
* come back to land and water after traveling some distance.
* travel in two directions.

Automobile emission
* are a major source of nitrogen oxides.
* are the environmental equivalent of chain smoking in the home
  - principal source of toluene to the ambient air
* have enormous environmental impacts

Car emission
* are a major cause of smog and climate change
  - source of nitrogen oxides
  - an ever-increasing contributor to the threat of global warming
  - one of the main sources of air pollution
* pollute the air, contribute to global warming, and threaten our health.

Carbon dioxide emission
* become concern
* become serious concern

Carbon emission
* are an important indicator of efficient energy use
  - from fossil fuel burning, cement manufacture and gas flaring only
  - the primary contributors to the greenhouse effect, which causes global warming
* released by motor vehicles are one of the primary causes of global warming.

Diesel emission
* are toxic and harmful to children.
* have the potential to cause adverse health effects.

Evaporative emission
* are a major source of the hydrocarbon compounds that form ground-level ozone
  - an ingredient in the formation of ground-level ozone pollution
  - lower in alcohol-fueled vehicles than gasoline vehicles
* come from the fuels, oils, rubber, and plastic parts used on our automobiles.
* play an important role in ozone formation.

Greenhouse gas emission
* affect temperature.
* contribute to events.

Light emission
* can also occur by phosphorescence, which gives longer-lived emission.
* is read with a high sensitivity photon counter.

Otoacoustic emission
* are faint sounds produced by most normal inner ears.
* are sounds produced by the normally functioning inner ear
  - in the inner ear
  - the ear generates
* provide a non-invasive window in to mammalian cochlear function.

Positron emission
* is most common in lighter elements with a low neutron to proton ratio.
* results in the production of gamma photons.