A recent settlement of up to $1.8 billion between Southern California Gas Co. and thousands of alleged victims has offered a measure of relief to some. But many residents say they still know painfully little about how the disaster affected their health.
The World Health Organization (WHO) tightened its air-quality guidelines for the first time since 2005, hoping to spur countries toward clean energy and prevent deaths and illness caused by air pollution.
Researchers say they found that the amount and proximity of natural gas wells to a home were linked to higher levels of certain chemical contaminants.

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