The natural gas leak at Porter Ranch has been plugged since mid-February. But during the four months it was active, the leak spewed around 97,000 tons of methane gas into the air -- making it the largest methane leak in U.S. history. Today, county officials are going to start testing for pollutants inside 100 homes in that community in northern Los Angeles County.
Officials Test Homes for Contamination After Porter Ranch Gas Leak
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