If you ever smell gas, or have any reason to suspect a problem, experts say to immediately exit the building or area, then call the authorities. For more, see the Southern California Gas Company safety page .

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Findings

Our readings indicated an average of about one leak for every four miles we drove in Pasadena, every five miles we drove in Inglewood, every five miles we drove in Chino and every six miles we drove in Orange.

Readings are from August 2014 through May 2015 and may not reflect current leaks, due to repairs or other changes. Data from these cities is not necessarily representative of the entire area.