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Data from the California Environmental Protection Agency places every community bordering the Chevron facility in the 99th centile for asthma.

A 2014 study in the British Journal of General Practice found that parents don’t tend to class their children as overweight until they are in the 99.7th centile, which is morbidly obese.

They are below the 5th centile on the child growth charts of the World Health Organisation – which means that fewer than 5% of healthy children would be expected to be their size.