"emission" - key terms from Wikipedia

broad emission	lines
carbon emission
continuum emission
electron emission
emission
emission	coefficient
emission	credits
emission	factors
emission	group
emission	levels
emission	limits
emission	line
emission	lines
emission	mix
emission	nebulae
emission	norms
emission	of greenhouse gases
emission	pattern
emission	performance standard
emission	permits
emission	reduction
emission	reductions
emission	regulations
emission	spectroscopy
emission	spectrum
emission	standards
emission	tomography
emission	trading
european emission	standards
field electron emission
ghg emission
low emission	zone
mass emission	norms
mev alpha emission
optical continuum emission
optical emission	lines
plasma emission	spectroscopy
positron emission
positron emission	tomography
radio emission
safety and emission
secondary emission
single photon emission	computed tomography
spontaneous emission
stimulated emission
synchrotron emission
thermal emission
thermionic emission
vehicle emission	standards
zero emission