Line Source

An array of pollutant sources along a defined path that can be treated in dispersion models as an aggregate uniform release of pollutants along a line. Example: the sum of emissions from individual cars traveling down a highway can be treated as a line source. Compare area source and point source.

In spectroscopy, an optical source that emits one or more spectrally narrow lines as opposed to a continuous spectrum. 2. In the geometric sense, an optical source having an emitting area in the form of a spatially narrow line, e.g., a slit. Synonym slit source.