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When she was 9 years old, Nalleli Cobo got a nosebleed that changed her life.

It was the first of many, soon accompanied by headaches, heart palpitations, stomach pain, spasms, and asthma.

Cobo lived in an apartment in South Los Angeles with three siblings, her great-grandparents, and her mother, who had immigrated there from Mexico. Talking with their neighbors, they learned that many people in the building were experiencing similar health issues. They suspected the oil-drilling site across the street.

Business Insider