Revealed: US hazardous waste is sent to Mexico – where a ‘toxic cocktail’ of pollution emerges

A Guardian and Quinto Elemento Lab investigation finds very high levels of lead and arsenic in homes near a factory processing US toxic waste

• Leer en espanol en Quinto Elemento Lab

Raquel Villarreal lives in a bright-yellow house in Mexico's Monterrey metropolitan area with her family and nine cats. Here, the emergency medicine doctor has raised three daughters, one of whom died at the age of 14.

Just steps away is an industrial plant that operates 24 hours a day, emitting pollution that neighbors say blankets the neighborhood and which Villarreal says is hard to remove from her car.