Video has shown the size of the blaze being tackled at an industrial unit in Lichfield.
Roads around Common Lane in Fradley have been closed while Staffordshire Fire and Rescue Service fight the fire and investigate whether any harmful chemicals are being released by the smoke.
Local residents captured videos of the fire shortly after it took hold:
Firefighters had earlier warned local residents to keep their windows shut while the exact nature of the blaze was investigated.
