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We investigate the role of environment on star-formation rates of galaxies atvarious cosmic densities in well-studied clusters. We present the star-formingmain sequence for 163 galaxies in four EDisCS clusters in the range 0.4 $<$ z$<$ 0.7. We use {\em Hubble Space Telescope}/Wide Field Camera 3 observationsof the H$\alpha$ emission line to span three distinct local environments: thecluster core, infall region, and external field galaxies. The main sequencedefined from our observations is consistent with other published H$\alpha$distributions at similar redshifts, but differs from those derived fromstar-formation tracers such as 24$\mu$m. We find that the H$\alpha$-derivedstar-formation rates for the 67 galaxies with stellar masses greater than themass-completeness limit of M$_*>$ 10$^{9.75}$M\textsubscript{$\odot$} showlittle dependence on environment. At face value, the similarities in thestar-formation rate distributions in the three environments may indicate thatthe process of finally shutting down star formation is rapid, however, thedepth of our data and size of our sample make it difficult to conclusively testthis scenario. Despite having significant H$\alpha$ emission, 21 galaxies areclassified as {\em UVJ}-quiescent and may represent a demonstration of thequenching of star formation caught in the act.

H$\alpha$-based Star Formation Rates in and around z $\sim$ 0.5 EDisCS clusters