Hereford and Worcester Fire Service is asking residents near the fire at an industrial site in Stourport-on-Severn to keep windows closed.
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The accident happened on the A46 in Drayton, near to Wildmoor Spa, at around 12.30pm.
33 people were assessed for possible carbon monoxide poisoning after an incident at an industrial premises in Ashbourne in Derbyshire.
Occasional rain easing. Feeling cold and damp.