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The county has used 12 mg/kg as a reference level, based on an estimate of the highest naturally occurring arsenic levels in all of Southern California.

They typically range from 2 to 11 mg/kg.

The agency says that even when compared to medium-sized cars that run on petrol and diesel, SUVs burn 20% more of such fuels as they weigh up to 300 kg more on average.

Their findings show that yields grew annually at a rate equivalent to about 33 kg of wheat per hectare.

With more than 40 percent of the U.S. population experiencing obesity, health care providers have an increased likelihood of seeing patients with a body mass index, or BMI, exceeding 70 kg/m2.