"emission" - key terms from Wikipedia

emission
emission credits
emission factors
emission figures
emission group
emission level
emission limits
emission line
emission lines
emission mix
emission nebulae
emission norms
emission of greenhouse gases
emission pattern
emission performance
emission reduction
emission reductions
emission spectra of rhodamine
emission spectroscopy
emission spectrum
emission standards
emission trading
emission vehicle
european emission standards
european union emission trading scheme
field electron emission
field emission
field emission electric propulsion
field emission gun
ghg emission
lava emission
light amplification by stimulated emission
low emission zone
plasma emission spectroscopy
positron emission
positron emission tomography
reduces carbon dioxide emission
secondary emission
single photon emission
single photon emission computed tomography
spontaneous emission
stimulated emission
stimulated emission of radiation
strong radio emission
submillimeter emission
synchrotron emission
thermal emission spectrometer
thermionic emission
vehicle emission standards
zero emission