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Evol Foods workers in Boulder, CO., had to be evacuated after high levels of carbon monoxide were reported to have made several employees sick.

According to 9 News, fire crews successfully evacuated 70 people from the building at 1845 Range Street.

Boulder Police say higher than normal Carbon Monoxide readings sickened numerous employees.

Police believe the high levels may have been a result of large batteries charging in the warehouse, batteries that power the company's forklifts.

Several workers were taken to the hospital for evaluation.