Environment Agency Wales said between one and two tonnes of ammonia gas were believed to have leaked.
Officials are investigating after ammonia gas leaked at a food factory on Anglesey.
The newspaper said it had seen documents in which the plant said it stored large amounts of anhydrous ammonia, but the worst scenario envisaged was a release of ammonia gas that would harm no-one.
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Anhydrous ammonia, a gas used in making fertilizer, can cause severe burns if it combines with water in the body.
According to the Centers for Disease Control and Prevention, anhydrous ammonia is a pungent gas with suffocating fumes that is used as a fertilizer.
Too much oxygen and the toxic ammonia in waste won't convert to nitrogen gas, which bubbles out.
It gobbles up gas as feedstock to make chemicals such as methanol and ammonia, a vital ingredient of fertiliser.
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Koch is among the world's largest oil traders, the third-largest in natural gas, and makes markets in dozens of commodities like propane, ammonia, coal, electric power and weather.
In time, says Simmons, he envisions turbines spinning on hundreds of those gulf platforms, which would be outfitted with gear to make ammonia at sea and send it to shore through pipelines now used for oil and gas.
According to the most recent 10-K for the firm, 64% of production costs for ammonia (at their East Dubuque facility) in the most recent year were due to natural gas.
It has become the biggest supplier of liquefied natural gas to the United States, and the world's top exporter of methanol and ammonia.
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