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In this brief review of recent work relating the DIBs to other gas-phaseconstituents of the ISM, we explore correlations between DIB equivalent widthsand the column densities of various atomic and molecular species, drawn from alarge database constructed for that purpose. The tightness and slopes of thecorrelations can provide information on how the DIBs might be related to thosespecies (physically, chemically, spatially) and on various properties of theDIB carriers. Deviations from the mean relationships can reveal dependences ofDIB strengths on other parameters, regional variations in DIB behavior, andindividual sight lines where unusual environmental conditions affect the DIBs.Variations in DIB profiles (e.g., wings, substructure) and relative strengthsmay be related to differences in physical conditions inferred from atomicand/or molecular absorption lines.

Diffuse Interstellar Bands: How Are They Related to Known Gas-Phase Constituents of the ISM?