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No one looked at what happens if the olefin reacts with ozone instead of hydroxyl radicals, he says.

The profit crunch is being driven by China's refiners boosting output of olefins such as ethylene to offset an expected decline in sales of petrol and diesel as electric vehicle take-up accelerates.

The fire had started at plant’s olefins unit, which makes plastics and rubber.

The fire started while the olefins unit was undergoing routine maintenance.

The fire at Shell’s Deer Park Chemicals facility started at about 2:56 p.m. in the olefins unit, the company said on Twitter.