The weather could have made the disaster much worse - a strong high pressure system gave just the right conditions to keep much of the pollution high above the ground.
One Hemel Hempstead resident said: "The explosion felt like the end of the world." Emergency services said it was "miraculous" no one died. Hertfordshire Chief Constable Frank Whiteley said: "By the grace of God it was 6am on a Sunday and not 9am on a Monday."
Hans Michels, Professor of Safety Engineering at Imperial College, London, added: "It's nothing short of a miracle so few people were hurt. If it had been the middle of the day anybody outside would have been killed."
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