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, which absorb and emit radiation in the thermal infrared range
Emission intensity, a measure of the emission rate of a given pollutant from a given source
Emission standards, requirements that set specific limits on the amount of certain pollutants that can be released into the environment
Emissions trading, a market-based approach used to pollution control