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In order to investigate the importance of different proposed quenchingmechanisms, we use an indirect method to estimate gas masses for ~62,000 SDSSDR7 galaxies. We infer gas surface densities from dust column densities astraced by extinction within the fibre, applying a metallicity correction toaccount for varying dust-to-gas ratios. We find that both gas fraction and starformation efficiency (SFE) decrease moving away from the star forming mainsequence (MS) towards quiescence for all galaxy masses. We further show thatboth quantities correlate similarly strongly with the departure from the MS,implying the need for any physical model of quenching to invoke a change in$\textit{both}$ gas fraction and SFE. Our results call for a betterunderstanding of the physical processes driving the decrease in star formationefficiency, which has received relatively little attention in the theory ofquenching until now.

Towards a deeper understanding of the physics driving galaxy quenching -- inferring trends in the gas content via extinction