Woke up to find out Manchester had a big news [PetrifiedR]
According to the Manchester Evening News, the leaked gas is phosphorus oxychloride.
(We might not understand, but knowing it can cause burns and poisoning is enough)
Phosphorus oxychloride (chemical formula: POCl3),
also known as phosphorus oxychloride, is a colorless to pale yellow, smoky, strongly smelling oily liquid that easily vaporizes.
In humid air, it hydrolyzes into phosphoric acid and hydrochloric acid droplets.
NHS issued a warning: if this substance comes into contact with the skin, it can cause burns and poisoning; if inhaled, it may cause coughing, burning sensation, sore throat, dizziness, nausea, and other symptoms.
Manchester's folks should take good care of themselves.