The San Diego County Board of Supervisors unanimously voted Tuesday to declare pollution at the Tijuana River Valley a public health crisis.

Supervisor Nora Vargas said the action is needed because of the decades-long contamination of River Valley, which has resulted in environmental and health damage. According to the county, the region has long suffered from poor air quality, sewage leaks, waste from industrial plants, tire waste, plastic pollution, sediment, and trash.