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The Herschel survey of the Galactic Plane (Hi-GAL) provides a uniqueopportunity to study star formation over large areas of the sky and differentenvironments in the Milky Way. We use the best studied Hi-GAL fields to date,two 2x2 tiles centered on (l, b) = (30, 0) deg and (l, b) = (59, 0) deg, tostudy the star formation activity using a large sample of well selected youngstellar objects (YSOs). We estimate the star formation rate (SFR) for thesefields using the number of candidate YSOs and their average time scale to reachthe Zero Age Main Sequence, and compare it with the rate estimated using theirintegrated luminosity at 70 micron combined with an extragalactic starformation indicator. We measure a SFR of (9.5 +- 4.3)*10^{-4} Msol/yr and (1.6+- 0.7)*10^{-4} Msol/yr with the source counting method, in l=30 deg and l=59deg, respectively. Results with the 70 micron estimator are (2.4 +-0.4)*10^{-4} Msol/yr and (2.6 +- 1.1)*10^{-6} Msol/yr. Since the 70 micronindicator is derived from averaging extragalactic star forming complexes, weperform an extrapolation of these values to the whole Milky Way and obtainSFR_{MW} = (0.71 +- 0.13) Msol/yr from l = 30 deg and SFR_{MW} = (0.10 +- 0.04)Msol/yr from l=59 deg. The estimates in l=30 deg are in agreement with the mostrecent results on the Galactic star formation activity, indicating that thecharacteristics of this field are likely close to those of the star-formationdominated galaxies used for its derivation. Since the sky coverage is limited,this analysis will improve when the full Hi-GAL survey will be available.

An analysis of star formation with Herschel in the Hi-GAL Survey. I. The Science Demonstration Phase Fields