Predictions for pollution from the winds of rotating massive stars. Left: Cumulative mass in the winds of selected massive stars of Limongi & Chieffi (2018) with a metallicity [Fe/H] = −1 and an initial rotational velocity of 300 km s⁻¹ (mass in M_⊙ in the top left) as a function of time. Top right: Total mass ejected in the stellar winds of a starburst with a total mass of 10⁸M_⊙ with a Salpeter IMF at various times after the burst (as indicated in the left panels by dotted vertical lines) versus the O/H. Middle right: Corresponding evolution of the N/O when the ejecta are diluted in ambient gas of the same mass; observational data are the same as in Fig. 1. Bottom right: Same as in the middle panel, but for C/O.