Dive Summary:

• 19 employees of a Phoenix, Arizona landfill were evaluated and treated following possible exposure to chemicals at the plant.
• The North Gateway Transfer Station and Materials Recovery Facility, a trash and recycling plant, was evacuated and investigated by a hazmat team, who could not locate anything unusual on site.
• The report of an "unknown odor" came from an employee who worked in the recycling area of the facility around 8:30 p.m. The worker had taken ill while 18 additional workers stated they felt nauseous.

From the article:

Phoenix  officials are expected to take over the scene and bring in a toxic team to investigate, (Phoenix fire spokesman) Caskey said.