In short, the leak is massive and researchers at UC Davis have indicated that they have never encountered as much methane in the air as they have over suburban Los Angeles in recent months.
While resident complaints of feeling ill, vomiting and nausea have been chalked off by officials as the result of breathing in the natural gas, it is quite possible and increasingly likely that what they are experiencing is actually radiation poisoning.
According to one report, the radiation levels in the Chernobyl control room following the 1986 disaster reached about 300 Sv per hour. That was enough to provide a lethal dose to anyone in the room within 1-2 minutes.
While the Los Angeles leak is widespread with radiation disbursing across the city, the fact remains that millions of Sieverts of radiation have been released and will continue to be released until such time that the well is permanently sealed.
The following map shows the spread of methane over the Los Angeles area and researchers from Eco Watch report that elevated levels of natural gas have been detected as far as 10 miles from the leak: