The source of a chemical haze that hit the south coast last summer was most likely a ship, a wreck or lost cargo in the Channel, a Defra report has said.
More than 150 people needed hospital treatment on 27 August after gas engulfed Birling Gap beach in Sussex.
He called for monitoring and equipment in case a similar event happens again.
Mr Lloyd said: "If one person had died - for example an asthmatic or an elderly person - and there was no equipment to store the gas, it would have been an absolute scandal.
"I am chasing the minister to demand funding for appropriate monitoring and equipment."
The beach was evacuated and South East Coast Ambulance declared a major incident.
People reported burning eyes, sore throats, skin irritation and vomiting and gave conflicting reports with some saying the smell was odourless, like burning plastic, and others describing it like chlorine and ammonia.
The report said gas detectors identified flammable gas and ammonia, but no levels that gave concern, while air quality monitoring stations recorded peaks in ozone and sulphur dioxide, which may have come from shipping lane exhaust fumes.
A Defra spokeswoman said: "Despite a comprehensive investigation it has not been possible to identify a specific source of the gas cloud.
"Given the meteorological evidence, the most likely source was a passing ship, lost cargo or a wreck in the English Channel."
Defra confirmed a sample was not taken for later analysis because appropriate equipment was not available at the site, and the gas dispersed quickly.
The report said there were about 180 ships in that part of the Channel that day.
Individual ships were the subject of a separate investigation, while the operational response was still being reviewed.