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We derive the Mg/H ratio in the Orion nebula and in 30 Doradus. We alsoderive the O/H and the Fe/O ratios in the extremely metal poor galaxy SBS0335-052. We estimate the dust depletions of Mg, Si, and Fe in Galactic andextragalactic H II regions. Based on these depletions we estimate the fractionof O atoms embedded in dust as a function of the O/H ratio. We find anincreasing depletion of O with increasing O/H. The O depletion increases fromabout 0.08 dex, for the metal poorest H II regions known, to about 0.12 dex,for metal rich H II regions. This depletion has to be considered when comparingnebular with stellar abundances.

On the O/H, Mg/H, Si/H and Fe/H Gas and Dust Abundance Ratios in Galactic and Extragalactic H II Regions